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Question

Malonic acid on heating gives acetic acid while succinic acid on heating gives:


A
butyric acid
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B
propionic acid
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C
succinic anhydride
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D
oxalic acid
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Solution

The correct option is C succinic anhydride

When malonic acid is heated, acetic acid and carbon dioxide is obtained due to thermal decarboxylation.

$$HOOC−CH_2​−COOH\rightarrow {} CH_3​COOH+CO_2​$$

Succinic acid on the other hand, gives an anhydride on heating.

$$HOOC−CH_2 - CH_2​−COOH\rightarrow {} Succinic \;Anhydride$$

 The anhydride so formed is a 5-member ring structure as shown above.
Hence option (C) is correct.

1750599_1719762_ans_5d6d73666bcc4e5596978a3c12026e68.PNG

Chemistry
NCERT
Standard XII

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