How many structural isomers can you draw for pentane?

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Three

FIve

Two

Four

answer is B.

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Detailed Solution

Structural isomers are compounds that have the same molecular formula but different structures.

Now, the molecular formula of pentane is $C_{5} H_{12}$ . Pentane has three structural isomers. Thus, its structural isomers are -

n-pentane: In this, all carbons are attached in a straight chain.
2-Methylbutane- It has one carbon as a methyl group on carbon-2 with four carbon straight chains. It is also called isopentane.
2,2-Dimethylpropane- It has 2 methyl groups at carbon 2a with a three-carbon straight chain. It is also called neo-pentane.

Therefore, pentane ahs 3-structural isomers: n-pentane, 2-methylbutane(isopentane) and dimethylpropane(neopentane).

Hence, the correct option is (B).