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Question

The COOH group in a carboxylic acid can be replaced by hydrogen atom by heating the acid with:
  1. Zn and HCl
  2. H2 in the presence of nickel
  3. bromine and concentrated aqueous alkali
  4. sodalime

A
Zn and HCl
B
bromine and concentrated aqueous alkali
C
H2 in the presence of nickel
D
sodalime
Solution
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The COOH group in a carboxylic acid can be replaced by hydrogen atom by heating the acid with sodalime, which acts as a decarboxylating agent.

CH3CH2COONa+NaOHCaO−−−−−−−−−DecarboxylationCH3CH3+Na2CO3

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