Q.

Propanoic acid is slightly weaker than acetic acid because

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a

Propanoic acid has three carbon atoms

b

Methyl group is electron with drawing

c

Acetic acid is stronger than propanoic acid

d

+ I effect of C2 H5 is more than – CH3

answer is B.

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Detailed Solution

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The propanoic acid has larger alkyl group which has + I effect than acetic acid.

As + I effect increases , the acidic strength of carboxylic acid decreases. 

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