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Tardigrade
Question
Chemistry
The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits
Q. The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits
2575
145
KCET
KCET 2010
Aldehydes Ketones and Carboxylic Acids
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A
optical isomerism
36%
B
geometric isomerism
21%
C
both optical and geometric isomerism
32%
D
neither optical nor geometric isomerism
11%
Solution:
When acetaldehyde is treated with aqueous sodium hydroxide solution, it undergoes aldol condensation (because of the presence of
α
−
H
atom) as.
Since, the aldol formed contains one asymmetric carbon atom, it will show optical isomerism.
On heating, aldol loses water and gives an alkene.
C
H
3
C
H
(
O
H
)
C
H
2
C
H
O
⟶
Δ
(shows geometrical isomerism)
C
H
3
C
H
=
C
H
C
H
O
The obtained alkene shows geometrical isomerism.
