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Hydrocarbons — NEET UG Chemistry PYQs

757 previous year questions from Hydrocarbons with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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1

H ₃ C - CH = CH ₂ + H - Br ( C ₆ H ₅ CO )₂ O ₂, Benzoyl peroxide H ₃ C - CH ₂- CH ₂- Br Which of the following rules is followed when the above reaction occurs?

MHT CET Medical 2026 Solution View → 2

Which of the following reagent is NOT required for the conversion of propyne to acetone?

MHT CET Medical 2026 Solution View → 3

Palladised charcoal with quinoline is known as

MHT CET Medical 2026 Solution View → 4

Chlorination of alkane is a photochemical process. It is initiated by the process of

MHT CET Medical 2026 Solution View → 5

Identify A and B in above reaction.

MHT CET Medical 2026 Solution View → 6

Chlorobenzene is formed by the reaction between benzene and chlorine in presence of AlCl ₃ . Which of the following species actually attacks the benzene ring in this reaction?

MHT CET Medical 2026 Solution View → 7

Identify the product obtained when toluene reacts with chlorine in the presence of FeCl ₃ .

MHT CET Medical 2026 Solution View → 8

In the combustion reaction of alkanes, if 1 mole of ethane is burnt, find number of moles of oxygen required?

MHT CET Medical 2026 Solution View → 9

Chlorobenzene on reaction with acetyl chloride in presence of anhydrous aluminum chloride forms,

MHT CET Medical 2026 Solution View → 10

What is the major product obtained by oxidation of phenylethene with KMnO ₄ in dilute H ₂ SO ₄ ?

MHT CET Medical 2026 Solution View → 11

Identify the products when benzene reacts with chlorine in the presence of (I) Fe and (II) anhydrous AlCl ₃ respectively from the following.

MHT CET Medical 2026 Solution View → 12

Identify the type of reaction when benzene reacts with nitrating mixture.

MHT CET Medical 2026 Solution View → 13

Which of the following gases is evolved as a byproduct (A) in the following reaction, HC CH + LiNH ₂ solvent HC = C ^- Li ^+ + ( A )

MHT CET Medical 2026 Solution View → 14

Which of the following alkenes forms formaldehyde and acetaldehyde on ozonolysis?

MHT CET Medical 2026 Solution View → 15

Aldehydes and Ketones can be converted to alkanes using (A). LiAlH₄ / H₃ O ^+ (B). Zn-Hg/ conc ^n HCl (C). NH₂ -NH₂ / KOH in ethylene glycol (D). K₂ Cr₂ O₇ / dil.H₂ SO₄

MHT CET Medical 2026 Solution View → 16

Identify the major product of the reaction between propene and HBr in the presence of peroxide.

MHT CET Medical 2026 Solution View → 17

Which one of the following alkenes forms the same product with HBr in the absence as well as in the presence of peroxide?

MHT CET Medical 2026 Solution View → 18

What is the general molecular formula for alkenes?

MHT CET Medical 2026 Solution View → 19

Which of the following types exhibits 100 % atom economy?

MHT CET Medical 2026 Solution View → 20

Consider the following reaction, and choose the correct option.

NEET 2026 Solution View → 21

Given below are two statements: Statement I: trans -But-2-ene upon treatment with Br ₂ in CCl ₄ gives the following product Statement II: cis -But-2-ene upon treatment with alkalin

NEET 2026 Solution View → 22

Among the following, the compound having conjugated double bonds is

NEET 2026 Solution View → 23

For the following reaction sequence, choose the correct option

NEET 2026 Solution View → 24

Two products X and Y are formed in the following reaction sequence. C ₆ H ₆ + CH ₃ Cl Anhydr. AlCl ₃ W [ warm ] dil. HNO ₃ + dil. H ₂ SO ₄ X + Y The suitable method that can be use

NEET 2026 Solution View → 25

The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively, are : C ₆ H ₆ + 6 Cl ₂ [ dark, cold ] Anhydr. AlCl ₃ X C ₆ H ₆ + 3 Cl

NEET 2026 Solution View → 26

Consider the following reaction sequences and choose the correct option.

NEET 2026 Solution View → 27

Which one of the following compounds does not decolourize bromine water?

NEET 2025 Solution View → 28

Which one of the following reactions does NOT give benzene as the product?

NEET 2025 Solution View → 29

The major product X formed in the following reaction sequence is:

NEET 2024 Solution View → 30

The alkane that can be oxidized to the corresponding alcohol by KMnO ₄ as per the equation is, when:

NEET 2024 Solution View → 31

Identify the correct reagents that would bring about the following transformation.

NEET 2024 Solution View → 32

The correct order for the rate of , -dehydrohalogenation for the following compounds is

NEET 2023 Solution View → 33

The major product of the following chemical reaction is:

NEET 2021 Solution View → 34

The major product formed in the dehydrohalogenation reaction of 2 -Bromopentane is Pent 2 -ene. This product formation is based on?

NEET 2021 Solution View → 35

The intermediate compound ' X ' in the following chemical reaction is:

NEET 2021 Solution View → 36

Reagent R will be:

NEET 2021 Solution View → 37

Which of the following is a free radical substitution reaction?

NEET 2020 Solution View → 38

Elimination reaction of 2 -Bromo-pentane to form pent- 2 -ene is (a) β -Elimination reaction (b) Follows Zaitsev rule (c) Dehydrohalogenation reaction (d) Dehydration reaction

NEET 2020 Solution View → 39

Which of the following alkane cannot be made in good yield by Wurtz reaction?

NEET 2020 Solution View → 40

An alkene on ozonolysis gives methanal as one of the product. Its structure is

NEET 2020 Solution View → 41

Glucose HCN X Hydrolysis Y Red P + HI Z IUPAC name of Y and Z

JIPMER 2019 Solution View → 42

CH CH [ H ₂ O ] Hg ²⁺ / H ⁺ A LiAlH ₄ ~B P / Br ₂ C final product C is

JIPMER 2019 Solution View → 43

If react with Cl ₂ in presence of light and then react with Na metal in dry ether, final product is

JIPMER 2019 Solution View → 44

The alkane that gives only one mono-chloro product on chlorination with Cl ₂ in presence of diffused sunlight is

NEET 2019 Solution View → 45

The most suitable reagent for the following conversion, is:

NEET 2019 Solution View → 46

In the following reaction, the number of sigma( ) bonds present in the product A is

NEET 2019 Solution View → 47

An alkene ' A ' on reaction with O 3 and Z n - H 2 O gives propanone and ethanal in equimolar ratio. Additional of H C l to alkene ' A ' gives ' B ' as the major product. The struc

NEET 2019 Solution View → 48

Identify the major products P ,   Q and R in the following sequence of reactions:

NEET 2018 Solution View → 49

Hydrocarbon A reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. A is?

NEET 2018 Solution View → 50

Which of the following is the major product in the reaction of HOBr with propene?

JIPMER 2017 Solution View → 51

1-butyne on oxidation with hot alkaline KMnO ₄ would yield. Which of the following as end product?

JIPMER 2017 Solution View → 52

Clemmensen reaction of ketone is carried out in the presence of

JIPMER 2017 Solution View → 53

Which among the following depicts the correct order of acidity?

NEET 2017 Solution View → 54

In the reaction, How many electron donating groups are attached with the carbon atom of unsaturated part of the product ' B ' ?

JIPMER 2016 Solution View → 55

Which of the following hydrocarbons is the most reactive towards addition of H ₂ SO ₄ ?

JIPMER 2016 Solution View → 56

Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction?

NEET 2016 Solution View → 57

In the reaction X and Y are:

NEET 2016 Solution View → 58

For the following reactions: a. CH 3 CH 2 CH 2 Br   +   KOH →   CH 3 CH = CH 2 +   KBr +   H 2 O b. c. Which of the following statements is correct?

NEET 2016 Solution View → 59

The compound that will react most readily with gaseous bromine has the formula:

NEET 2016 Solution View → 60

In the given reaction, the product P is

NEET 2016 Solution View → 61

Consider the nitration of benzene using mixed conc. H 2 S O 4 and H N O 3 . If a large amount of K H S O 4 is added to the mixture, the rate of nitration will be:

NEET 2016 Solution View → 62

H and S for the reaction, Ag ₂ O ( s ) 2 Ag (s)+ 1 2 O ₂( ~g ) , are 30.56 ~kJ ~mol ⁻¹ and 66.00 JK ⁻¹ ~mol ⁻¹ respectively. The temperature at which the free energy change for the

JIPMER 2015 Solution View → 63

Find out the correct stereoisomeric product for the following reaction,

JIPMER 2015 Solution View → 64

X, Y and Z respectively are

JIPMER 2015 Solution View → 65

In the reaction with HCl , an alkene reacts following the Markovnikov's rule to give the product 1 - chloro - 1 - methylcyclohexane. The possible reaction of the alkene is

NEET 2015 Solution View → 66

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

NEET 2015 Solution View → 67

The oxidation of benzene by V 2 O 5 in the presence of air produces:

NEET 2015 Solution View → 68

The reaction of C 6 H 5 C H = C H C H 3 with HBr produces:

NEET 2015 Solution View → 69

Given, The enthalpy of hydrogenation of these compounds will be in the order as:

NEET 2015 Solution View → 70

Which one of the following is aromatic?

JIPMER 2014 Solution View → 71

Identify Z in the sequence of reactions:

NEET 2014 Solution View → 72

Addition of water to alkynes occurs in acidic medium and in the presence of Hg ²⁺ ions as a catalyst. Which of the following products will be formed on addition of water to but-1-y

JIPMER 2013 Solution View → 73

Identify the major product ' X ' obtained in the following reaction. 2, 3-dimethyl butan -2- ol Conc. H ₂ SO ₄ X

JIPMER 2013 Solution View → 74

Phenol is distilled with Zn dust followed by Friedel-Crafts alkylation with propyl chloride in the presence of AlCl ₃ to give a compound (b). (b) is oxidised in the presence of air

NEET 2013 Solution View → 75

The structure of isobutyl group in an organic compound is

NEET 2013 Solution View → 76

Nitrobenzene on reaction with conc. HNO ₃ / H ₂ SO ₄ at 80-100^ C forms which one of the following products?

NEET 2013 Solution View → 77

In the reaction, A is

NEET 2013 Solution View → 78

Which of the following compounds will not undergo Friedal-Craft's reaction easily?

NEET 2013 Solution View → 79

Which one of these is not true for benzene?

JIPMER 2012 Solution View → 80

Petrol for aviation purpose must contain

JIPMER 2012 Solution View → 81

Propyne on passing through red hot copper tube forms

JIPMER 2012 Solution View → 82

In the following reaction,

NEET 2012 Solution View → 83

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

NEET 2012 Solution View → 84

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

NEET 2011 Solution View → 85

CaC ₂ and H ₂ O react to produce

JIPMER 2010 Solution View → 86

The only o p-directing group which is deactivating in nature is

JIPMER 2010 Solution View → 87

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

NEET 2010 Solution View → 88

The homologue of ethyne is

JIPMER 2009 Solution View → 89

Nitrobenzene can be prepared from benzene by using a mixutre of conc HNO ₃ and conc. H ₂ SO ₄ . In the mixture, nitric acid acts as a/an :

NEET 2009 Solution View → 90

Benzene reacts with CH ₃ Cl in the presence of anhydrous AlCl ₃ to form

NEET 2009 Solution View → 91

Consider the following reaction The product Z is :

NEET 2009 Solution View → 92

Benzene reacts with CH ₃ Cl in the presence of anhydrous AlCl ₃ to form -

NEET 2009 Solution View → 93

Standard free energies of formation (in kJ / mol ) at 298 ~K are -237.2,-394.4 and -8.2 for H ₂ O (l) CO ₂(g) and pentane (g) , respectively. The value of E_ cell ^0 for the pentan

NEET 2008 Solution View → 94

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

NEET 2008 Solution View → 95

A (predominantly) is

NEET 2008 Solution View → 96

Which one the following is most reactive towards electrophilic attack?

NEET 2008 Solution View → 97

Which one of the following alkenes will react faster with H ₂ under catalytic hydrogenation conditions? ( R= Alkyl substituent )

JIPMER 2007 Solution View → 98

Products of the following reaction CH ₃ C C - CH ₂ CH ₃ [(2) Hydrolysis ] (1) O ₃ are

JIPMER 2007 Solution View → 99

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

JIPMER 2007 Solution View → 100

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called:

NEET 2007 Solution View → 101

The order of decreasing reactivity towards an electrophilic reagent, for the following would be: (i) benzene (ii) toluene (iii) chlorobenzene (iv) phenol

NEET 2007 Solution View → 102

Predict the product C obtained in the following reaction of butyne- 1 : CH ₃ CH ₂- C CH + HCl B HI C

NEET 2007 Solution View → 103

Which of the compounds with molecular formula C ₅ H ₁₀ yields acetone on ozonolysis?

NEET 2007 Solution View → 104

By which one of the following compounds both CH ₄ and CH ₃- CH ₃ can be prepared in one step ?

JIPMER 2006 Solution View → 105

The reaction of HBr with in the presence of peroxide will give :

JIPMER 2006 Solution View → 106

reacts with acetic acid in presence of Hg ²⁺ to give:

JIPMER 2006 Solution View → 107

Butyne-1 and butyne- 2 can be distinguished by

JIPMER 2005 Solution View → 108

Which one of the following alkenes will react faster with H ₂ under catalytic hydrogenation conditions?

NEET 2005 Solution View → 109

Product of the following reaction: CH ₃ C CH ₂ CH ₃ (ii) hydrolysis (i) O ₃ are

NEET 2005 Solution View → 110

Which one of the following compounds is most acidic?

NEET 2005 Solution View → 111

What is obtained, when potassium succinate soluton is electrolysed?

JIPMER 2004 Solution View → 112

What is 'X' in the following sequence? Ar. N ₂ Cl [ KCN ] CuCN Z H . OH Y [ ] soda-lime X

JIPMER 2004 Solution View → 113

Reaction of HBr with propene in the presence of peroxide gives:

NEET 2004 Solution View → 114

Which of the following is least reactive in a nucleophilic substitution reaction?

NEET 2004 Solution View → 115

Using anhydrous AlCl ₃ as catalyst, which one of the following reactions produces ethylbenzene ( PhEt ) ?

NEET 2004 Solution View → 116

Which one of the following is a free radical substitution reaction?

NEET 2003 Solution View → 117

The compound on reaction with NaIO ₃ in the present of KMnO ₄ gives:

NEET 2003 Solution View → 118

The correct order of reactivity towards the electrophillic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is:

NEET 2003 Solution View → 119

When CH ₃ CH ₂ CHCl ₂ is treated with NaNH ₂ , the product formed is:

NEET 2002 Solution View → 120

Which of the following compounds is commonly used as a solvent in the Friedel-Crafts alkylation reaction?

NEET Solution View →
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