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Aldehydes, Ketones and Carboxylic Acids
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Carboxylic acids: acidity, preparation, derivatives, HVZ reaction
JEE Main level
Single correct option
Difficulty 2 of 3
co185
Propanedioic acid (malonic acid) is heated just above its melting point (about 140
∘
C). The organic product is
A
propanoic acid
B
ethanoic acid
C
ethanedioic acid
D
methanoic acid
Answer: B
Malonic acid has a carboxyl group beta to another carbonyl group, so it loses
CO
X
2
on heating:
HOOCCH
X
2
COOH
CH
X
3
COOH
+
CO
X
2
.
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