A hydrocarbon C5H8 gives a white precipitate with ammoniacal AgNO3 and adds two moles of H2 over Ni to give unbranched pentane. The hydrocarbon is

JEE Main levelSingle correct optionDifficulty 2 of 3si149

A hydrocarbon $C X_{5} H X_{8}$ gives a white precipitate with ammoniacal $AgNO X_{3}$ and adds two moles of $H X_{2}$ over Ni to give unbranched pentane. The hydrocarbon is

The precipitate with ammoniacal

AgNO X_{3}

needs a terminal alkyne with an acidic

C \equiv C - H

. Two moles of

H X_{2}

and an unbranched product point to

CH X_{3} CH X_{2} CH X_{2} C \equiv CH

. Pent-2-yne is internal and the dienes do not give the precipitate.