The compounds $X(C_5H_8)$ reacts with ammoniacal $AgNO_3$ to give a white precipitate and on oxidation with hot alkaline $KMnO_4$ gives the acid,$(CH_3)_2CHCOOH$.Therefore X is

Question

$\begin{array}{1 1}(a)\;CH_2=CHCH=CHCH_3\\(b)\; CH_3(CH_2)_2C\equiv CH\\(c)\;(CH_3)_2CH-C\equiv CH\\(d)\;(CH_3)_2C=C=CH_2\end{array}$