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(B) Step $1$: The given molecular formula is $C_5H_{12}$, which follows the general formula $C_nH_{2n+2}$, indicating it is an alkane.Step $2$: The ch

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$3$

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(B) Step $1$: The given molecular formula is $C_5H_{12}$, which follows the general formula $C_nH_{2n+2}$, indicating it is an alkane.Step $2$: The chain isomers are structural isomers that differ in the arrangement of the carbon chain.Step $3$: The possible isomers for $C_5H_{12}$ are:$(i)$ $CH_3-CH_2-CH_2-CH_2-CH_3$ (n-pentane)(ii) $CH_3-CH(CH_3)-CH_2-CH_3$ (isopentane or $2-$methylbutane)(iii) $CH_3-C(CH_3)_2-CH_3$ (neopentane or $2,2-$dimethylpropane)Step $4$: There are $3$ possible chain isomers.

The number of chain isomers possible for the hydrocarbon with molecular formula $C_5H_{12}$ is

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