Benzaldehyde undergoes Claisen’s condensation with another aldehyde to give cinnamaldehyde. The aldehyde is:

Formaldehyde

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Acetaldehyde

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Crotonaldehyde

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Propionaldehyde

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Solution

The correct option is B Acetaldehyde
$C_{6} H_{5} C H O + C H_{3} C H O A l k a l i - -- \to C_{6} H_{5} C H = C H C H O C i n n a m a l d e h y d e$

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Similar questions

Q. Benzaldehyde reacts with X to produce cinnamaldehyde in Claisen condensation. X is :

An aldehyde, ( P) which does not undergo self aldol condensation gives benzaldehyde and two moles of ( Q) on ozonolysis. Compound ( Q), on oxidation with silver ions gives oxalic acid. The structure of ( P) is given as

Q. Aldehydes that do not undergo aldol condensation are
1. propanal
2. trichloroethanal
3. 2-phenylethanal
4. ethanal
5. benzaldehyde

Q. Aldehydes that do not undergo aldol condensation are:
(1) propanal
(2) trichloroethanal
(3) 2-phenylethanal
(4) ethanal
(5) benzaldehyde

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

and

D . C

is an arylalcohol with the formula,

C_{7} H_{8} O

.
Identify

A

and

B

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Benzaldehyde undergoes Claisen’s condensation with another aldehyde to give cinnamaldehyde. The aldehyde is:

The correct option is B AcetaldehydeC6H5CHO+CH3CHOAlkali−−−→C6H5CH=CHCHO Cinnamal dehyde

The correct option is B Acetaldehyde
$C_{6} H_{5} C H O + C H_{3} C H O A l k a l i - -- \to C_{6} H_{5} C H = C H C H O C i n n a m a l d e h y d e$