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JEE Main & Advanced Chemistry PYQs with solutions

Chapter-wise Chemistry previous year questions for JEE Main & Advanced. Open any question for options, correct answer and solution.

13,361 questions33 chapters
1

Considering LiBH ₄ reduces an ester group to the corresponding alcohol and does not reduce a carboxylic acid group, the correct statement about the major products P , Q , R and S i

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2

The major product of which of the following reaction is not obtained by rearrangement reaction?

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3

Consider the following reaction. Statement I : In the above reaction, product formed will be a mixture of benzyl alcohol and iodobenzene. Statement II : In the above reaction, the

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4

Consider the following reaction. The major product (P) formed is:

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5

' x ' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. ' y ' is the major product obtain

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6

' x ' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K. ' y ' is the product which is obtai

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7

Match the major products obtained in the reactions given in List-I with the corresponding structures in List-II and choose the correct option. List-I List-II (P) (1) (Q) (2) (R) (3

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8

In the following reaction sequence, P , Q , S and T are the major products. The correct statement(s) about P , Q , S and T is(are)

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9

Passage: Consider the following reaction sequence in which J , K , L and M are the major products. Given: Atomic mass (in amu): H : 1 , C : 12 , N : 14 , O : 16 , S : 32 , Br : 80

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10

A known artificial sweetener X is composed of 4-chloro-4-deoxy- -D-galactose and 1,6-dichloro-1,6-dideoxy- -D-fructose joined by a glycosidic linkage. Structure of D-galactose is g

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11

The correct statement(s) regarding sugars is(are) Given: Specific rotations of L-( - )-glucose and L-( + )-fructose are -52.5^ and +92.5^ , respectively.

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12

In the following reaction sequence, major products X and Y are acyclic monomers. 500 mol of X completely reacts with 500 mol of Y to give 1 mol of a single biodegradable acyclic co

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13

The sum of total number of carbonyl groups ( >C=O ) present in the major products X and Y in the following reactions is ____.

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14

Complete the following reaction sequence and give the name of major product 'P'. CH₃-CH₂-C N [ (ii) H₃O^+] (i) OH^-/H₂O/ [ (iv) H₂O] (iii) Cl₂/ Red P P (Major product)

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15

The descending order of acidity among the following compounds is: A. Phenol B. 4 -nitrophenol C. 4 -methoxyphenol D. 4 -nitrobenzoic acid E. Benzoic acid Choose the correct answer

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16

The correct order of dipole moments for the given species is

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17

Consider the following species: SOCl ₂ , XeOF ₄ , ClF ₃ , ClF ₅ , XeF ₅^+ , SO ₃²⁻ , XeF ₃^+ , SF ₄ List-I contains different molecular shapes and List-II contains total number of

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18

The correct order of ONO bond angle in the given species is

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19

Consider the following reactions in which all the reactants and products are present in gaseous state 2xy x₂ + y₂ K₁ = 2.5 10^5 xy + 1 2 z₂ xyz K₂ = 5 10⁻³ The value of K₃ for the

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20

Solid carbon, CaO and CaCO₃ are mixed and allowed to attain equilibrium at T K. CaCO ₃(s) CaO (s) + CO ₂(g) K_ p₁ = 0.08 atm C (s) + CO ₂(g) 2 CO (g) K_ p₂ = 2 atm The partial pres

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21

In a closed flask at 600 K, one mole of X₂ Y₄ (g) attains equilibrium as given below : X ₂ Y ₄(g) 2 XY ₂(g) At equilibrium, 75 % X₂ Y₄ (g) was dissociated and the total pressure is

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22

For a reversible reaction R P , at constant temperature, both the forward and the backward reactions are first order elementary reactions with rate constants k_f and k_b , respecti

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23

For a first-order reaction R P at a given temperature, k is the rate constant. For this reaction, at the given temperature, the concentrations of R and P at a time t are [ R ] and

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24

Given below are two statements: R=8.314 J K ⁻¹ mol ⁻¹ and 1 cal =4.2 J Statement I: When E_a=12.6 kcal/mol, the room temperature rate constant is doubled by a 10 ,^ C increase in t

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25

Thyroxine, the hormone has given below structure The percentage of iodine in thyroxine is ____ % . (nearest integer) (Given molar mass in g mol ⁻¹ C : 12. H : 1, O : 16 , N : 14, I

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26

Aspartame, an artificial sweetener, is a dipeptide aspartyl phenylalanine methyl ester. The structure of aspartame is

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27

The reaction used for preparation of soap from fat is :

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28

The correct statement(s) regarding the periodic properties of elements is(are)

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29

Match List-I with List-II. List-I Electronic configuration of neutral atom (where n=2 ) List-II 1^ st Ionization Energy (kJ mol ⁻¹ ) A. ns^2 I. 2080 B. ns^2np^1 II. 899 C. ns^2np^3

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30

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively

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31

Reaction of PtF ₆ with oxygen ( O ₂ ) gas results in the formation of an ionic compound, X ^+ Y ^- . Correct statement(s) is(are)

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32

The total number of all possible isomers for the square planar complex with formula K [ M(NCS)(NO ₂ )(gly) ] is ____. ( M = metal ion and gly = NH ₂ CH ₂ COO ^- )

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33

Consider that the coordinating atoms of the ligands in cis -[Co(NH₃ )₄ Cl₂ ]Cl and mer -[Co(NH₃ )₃ Cl₃ ] octahedral complexes are at the vertices of an octahedron. The sum of total

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34

Given below are two statements: Statement I: The number of pairs among [ Ti ⁴⁺, V ²⁺] , [ V ²⁺, Mn ²⁺] , [ Mn ²⁺, Fe ³⁺] and [ V ²⁺, Cr ²⁺] in which both ions are coloured is 3 . S

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35

Given below are two statements for catalytic properties of transition metals. Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for for

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36

The correct order of first ( _i H₁) and second ( _i H₂) ionisation enthalpy values of Cr and Mn are : A. _i H₁ : Cr > Mn B. _i H₂ : Cr > Mn C. _i H₁ : Mn > Cr D. _i H₂ : Mn > Cr Ch

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37

At 300 K, the molar conductivities of the aqueous solutions of three salts at two different concentrations are given below: Salt Concentration (M) Molar conductivity (S cm ^2 mol ⁻

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38

Given at 298 K: E^ _ Fe²⁺/Fe = X Volt; E^ _ Fe³⁺/Fe = Y Volt. The E^ _ Fe³⁺/Fe²⁺ in Volt at 298 K is given by:

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39

For a general redox reaction Anode : Red ₁ Ox ₁^ n₁^+ + n₁ e^- Cathode : Ox ₂ + n₂ e^- Red ₂^ n₂^- Which of the following statement is incorrect ?

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40

Given below are two statements: Statement I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillat

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