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Question

Malonic acid on heating gives ____ while on decarboxylation gives _____


A
acetic acid, ethane
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B
propanoic acid, methane
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C
propanoic acid, ethane
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D
acetic acid, methane
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Solution

The correct option is B acetic acid, methane
Reactions:

1) Heating of malonic acid: $$\mathrm{COOH-CH_2-COOH \xrightarrow{\Delta} \underset{Acetic \ Acid}{CH_3-COOH}}$$

2) Decarboxylation of malonic acid: $$\mathrm{HOOC-CH_2-COOH \xrightarrow{Sodalime} \underset{Methane}{CH_4}}$$

Hence, Malonic acid on heating gives acetic acid while on decarboxylation gives methane.
Hence, Option "D" is the correct answer.

Chemistry

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