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The Aldol Addition

Acetaldehyde ...

Question

Acetaldehyde undergoes reaction in the presence of dil. NaOH to give

A

Ethyl acetate

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B

Butanoic acid

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C

Acetic acid

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D

3-Hydroxy butanal

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Solution

The correct option is D 3-Hydroxy butanal
Acetaldehyde (A) reacts with NaOH undergoes aldol condensation forming beta-hydroxyacetaldehyde on heating gives alpha-beta-unsaturated aldehyde(C)

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Similar questions

Q. An unknown aldehyde

^{'} A^{'}

on reacting with alkali gives a

β

- hydroxy aldehyde, which loses water to form an unsaturated aldehyde,

2 -

butanal. Another aldehyde

^{'} B^{'}

undergoes disproportionation reaction in the presence of conc. alkali to form products

C

D . C

is an arylalcohol with the formula,

C_{7} H_{8} O

A

B

^{'} X^{'} (C_{2} H_{4} O)

on oxidation gives

^{'} Y^{'} (C_{2} H_{4} O_{2}) .^{'} X^{'}

undergoes haloform reaction. On treatment with

H C N^{'} X^{'}

forms a product

^{'} Z

which on hydrolysis gives

2 -

hydroxy propanoic acid.
Name of the product when

^{'} X^{'}

d i l . N a O H

(C_{4} H_{8} O)

, which undergoes haloform reaction gives compound B on reduction. B on heating with sulphuric acid gives a compound C which forms mono-ozonide D. D on hydrolysis in presence of zinc dust gives only acetaldehyde E. Identify A, B, C, D and E. Write the reactions involved.

Q. What is the action of dil

N a O H

on ethanal (acetaldehyde)? Name the reaction.

Q. Give balanced equations for the following reactions.
(i) Acetaldehyde is heated with hydroiodic acid in the presence of red phosphorous.
(ii) Calcium acetate is subjected to dry distillation.
(iii) Sodium ethoxide is treated with ethyl bromide.
(iv) Benzaldehyde is treated with sodium bisulphite.

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