(D) $Linolenic$ acid is a polyunsaturated fatty acid with the chemical formula $C_{18}H_{30}O_2$. It contains $18$ carbon atoms and $3$ carbon-carbon

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(D) $Linolenic$ acid is a polyunsaturated fatty acid with the chemical formula $C_{18}H_{30}O_2$. It contains $18$ carbon atoms and $3$ carbon-carbon double bonds $( > C=C < )$. The structure is $CH_3CH_2CH=CHCH_2CH=CHCH_2CH=CH(CH_2)_7COOH$. Therefore,the number of $ > C=C < $ bonds present in a linolenic acid molecule is $3$.