Q: Considering the reaction sequence given below, the correct statement(s) is(are)

Propanoic acid is having α-hydrogen hence it is halogenated at the α-position on treatment with chlorine or bromine in the presence of small amount of red phosphorus to give α-bromo propanoic acid. The reaction is known as Hell-Volhard-Zelinsky reaction. Second step of the reaction involves Gabriel phthalimide synthesis Where potassium salt of phthalimide which on heating with 2-bromo propanoic acid followed by alkaline hydrolysis produces t

Question 1

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

Accepted Answer

Reaction 1: The reactant is 2,4-dimethyl-3-oxopentanedioic acid, which is a -keto acid (both - CO _2 H groups are at the -position with respect to the central ketone group). -keto acids readily undergo decarboxylation upon heating. Since there are two such groups, it will undergo double decarboxylation. HO _2 C - CH ( CH _3)- C (= O )- CH ( CH _3)- CO _2 H CH _3- CH _2- C (= O )- CH _2- CH _3 + 2 CO _2 The major product X is 3-pentanone. Number of carbonyl groups (> C=O ) in X = 1. Reaction 2: T

Question 2

Monocyclic compounds P , Q , R and S are the major products formed in the reaction sequences given below. The product having the highest number of unsaturated carbon atom(s) is-

Accepted Answer

Answer option index: 3

Question 3

The correct reaction/reaction sequence that would produce a dicarboxylic acid as the major product is

Accepted Answer

Answer option index: 2

Question 4

In the following reaction sequence, the major product P is formed. Glycerol reacts completely with excess P in the presence of an acid catalyst to form Q . Reaction of Q with excess NaOH followed by t

Accepted Answer

3 2 mole soap. = 3 2 606 gm =909 gm

Question 5

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

Accepted Answer

Toluene part of the reactant in the first reaction undergoes oxidation with KMnO 4 , forms benzoic acid. In this conversion, alkyl part of toluene converts into carboxylic group. So,  P  is a monocarboxylic acid. Both ester and acid halides undergo hydrolysis to give carboxylic acid. Hence, the product  Q  is the dicarboxylic acid. And it is known as isophthalic acid. In the third reaction, ester undergo hydrolysis in the first step, which results beta keto acid. Beta ke

Question 6

Consider the following reaction scheme and choose the correct option(s) for the major products Q, R and S .

Accepted Answer

Styrene on hydroboration-oxidation reaction gives a primary alcohol. It follows anti-Markonikov's rule to give alcohol from alkenes. Primary alcohols give carboxylic acids on oxidation with Jone's reagent. The alpha chloro carboxylic acid is produced on HVZ reaction of carboxylic acid produced. 2-phenyl ethanol on reaction with thionyl chloride produces 1-chloro-2-phenylethane. The chloro group is replaced with cyano group. The cyanide on hydrolysis give carboxylic acid. The carboxylic a

Question 7

Match the reactions (in the given stoichiometry of the reactants) in List-I with one of their products given in List-II and choose the correct option.   List-I   List-II (P) P 2 O 3 + 3 H 2

Accepted Answer

Phosphorus trioxide reacts with water to form phosphorous acid, P 2 O 3 + 3 H 2 O &#8594; 2 H 3 PO 3 When acetic acid is heated with phosphorus pentachloride, acetyl chloride is obtained. In this reaction, &#8722; COOH group is converted to &#8722; COCl group. The side products are phosphorus oxychloride and HCl . PCl 5 + CH 3 COOH &#8594; CH 3 COCl + POCl 3 + HCl P 4  undergo disproportionation reaction with sodium hydroxide. P 4 + 3 NaOH + 3 H 2 O &#160; &#8594; PH 3 + 3 NaH 2 PO 2 Due to

Question 8

Considering the reaction sequence given below, the correct statement(s) is(are)

Accepted Answer

Propanoic acid is having  &alpha;-hydrogen hence it is halogenated at the &alpha;-position on treatment with chlorine or bromine in the presence of small amount of red phosphorus to give &alpha;-bromo propanoic acid. The reaction is known as Hell-Volhard-Zelinsky reaction. Second step of the reaction involves Gabriel phthalimide synthesis Where potassium salt of phthalimide which on heating with 2-bromo propanoic acid  followed by alkaline hydrolysis produces t

Question 9

Which of the following reactions produce(s) propane as a major product?

Accepted Answer

A C

Question 10

The correct order of acid strength of the following carboxylic acids is -

Accepted Answer

Acidic strength ∝ stability of conjugate chain Order of Acidic strength ⇒ I > II > III > IV

Carboxylic Acid Derivatives — Previous Year Questions & Solutions