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Intramolecular Aldol Condensation

Ethanal CH3C...

Question

Ethanal $(C H_{3} C H O)$ undergoes aldol condensation reaction. Give reason.

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Solution

Ethanal $(C H_{3} C H O)$ undergoes aldol condensation reaction due to presence of $α -$ hydrogen atom. Aldol condensation reaction is given by aldehydes and ketones having $α -$ hydrogen atom. Aldehydes and ketones lacking $α -$ hydrogen atom undergo Cannizzaro reaction.

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Q. Explain aldol condensation reactions of ethanal & propanone.

Q. Assertion (A) :

C H_{3} C H O

on reaction with dil. NaOH forms aldol.
Reason (R) : Aldehydes and ketones having

α

-hydrogen undergo aldol condensation.

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

Q. Which of the given aldehydes will not give aldol condensation reactions?

(1) Propanal (2) Ethanal (3)

2.2

-dimethylpropane (4)

2, 2

-dimethyl butanal (5) Benzaldehyde

Q. Which of the following does not undergoes aldol condensation reaction?

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