Question

which is the third higher homologue of CH3-CH2-COOH​

Answer 1

Answer D butyric acid

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Answer 2

The answer is option c).

Explanation:

Any higher homologue of a chemical species differs from the previous homologue by a $CH_2$unit.

In the given question the substance is $CH_3CH_2COOH$

So, the next higher homologue would be $CH_3CH_2CH_2COOH$

The second higher homologue would be $CH_3CH_2CH_2CH_2COOH$

And the third higher homologue would be $CH_3CH_2CH_2CH_2CH_2COOH$

This is option number c) in the given question.