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Standard XII

Chemistry

Haloacids

In the presen...

Question

In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which $α$ - hydrogen has been replaced by halogen. This reaction is known as:

Wolff-Kishner reaction

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Etard reaction

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Hell-Volhard_Zelinsky reaction

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Rosenmund reaction

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Solution

The correct option is B Hell-Volhard_Zelinsky reaction
The Hell–Volhard–Zelinsky halogenation reaction halogenates carboxylic acids at the α carbon.

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Similar questions

Q. Aldehydes, Ketones and Carboxylic acids are Carbonyl compounds.
(a) Aldehydes differ from Ketones in their oxidation reactions. Illustrate with one example.
(b) How will you prepare benzaldehyde by Gatterman-Koch reaction?
(c) Write the reactions of carboxylic acid with the following reagents. (Write the chemical equations)
(i) Thionyl chloride

(S O {C l}_{2})

(ii) Chlorine in presence of small amount of red phosphorous.
(iii) Lithium Aluminium hydride

(L i A l H_{4})

/ether.

Q. The carboxylic acids react with hydrazoic acid in presence of

H_{2} S O_{4}

to form a primary amine. This reaction is called as :

Q. An aliphatic unsaturated hydrocarbon

(A)

when treated with

H g S O_{4} / H_{2} S O_{4}

yields a compound

(B)

having molecular formula

C_{3} H_{6} O

(B)

on oxidation with concentrated

H N O_{3}

gives two compounds

(C)

and

(D)

. Compound

(C)

when treated with

P {C l}_{5}

gives compound

(E)

(E)

when reacts with ethanol gives a sweet smelling liquid

(F)

. Compound

(F)

is also formed when

(C)

reacts with ethanol in the presence of concentrated

H_{2} S O_{4}

.
(i) Identify the compound

A, B, C, D, E

and

F

.
(ii) Give the chemical equation for the reaction of

(C)

with chlorine in the presence of red phosphorous and name the reaction.

Q. A hydrocarbon 'X' on reaction with

B r_{2}

in presence of

C C l_{4}

decolourises bromine water.
Also 'X' reacts with

K M n O_{4}

in the presence of an acid to give two moles of the same carboxylic acid.
The structure of 'X' is:

Q. Assertion :During

H V Z

reaction of a carboxylic acid, an alpha hydrogen of acid is replaced by halogen. Reason:

R C H X C O X

formed in the intermediate step supplies X to

R C H_{2} C O O H

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In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which α - hydrogen has been replaced by halogen. This reaction is known as:

The correct option is B Hell-Volhard_Zelinsky reaction The Hell–Volhard–Zelinsky halogenation reaction halogenates carboxylic acids at the α carbon.

In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which $α$ - hydrogen has been replaced by halogen. This reaction is known as:

The correct option is B Hell-Volhard_Zelinsky reaction
The Hell–Volhard–Zelinsky halogenation reaction halogenates carboxylic acids at the α carbon.