The most volatile alkane is

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(C) Volatility is inversely proportional to the boiling point $(B.P.)$.Among the given alkanes,$n-$pentane,isopentane,and neopentane are isomers with

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neopentane

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(C) Volatility is inversely proportional to the boiling point $(B.P.)$.Among the given alkanes,$n-$pentane,isopentane,and neopentane are isomers with the molecular formula $C_5H_{12}$.$n-$hexane has a higher molecular mass,so it has a higher $B.P.$ and is less volatile.Among the $C_5$ isomers,neopentane ($2$,$2$-dimethylpropane) is the most branched,which results in the smallest surface area and the weakest van der Waals forces.Therefore,neopentane has the lowest $B.P.$ and is the most volatile.

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