Which of the following is not an isomer of pe | vedclass

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Question

(C) Pentane has the molecular formula $C_5H_{12}$. Isomers must have the same molecular formula but different structural arrangements.$1.$ $n$-pentane

Vedclass · Accepted Answer

$2,3$-dimethylbutane

Vedclass · Answer

(C) Pentane has the molecular formula $C_5H_{12}$. Isomers must have the same molecular formula but different structural arrangements.$1.$ $n$-pentane: $CH_3-CH_2-CH_2-CH_2-CH_3$ $(C_5H_{12})$$2.$ $2,2$-dimethylpropane: $CH_3-C(CH_3)_2-CH_3$ $(C_5H_{12})$$3.$ $2$-methylbutane: $CH_3-CH(CH_3)-CH_2-CH_3$ $(C_5H_{12})$$4.$ $2,3$-dimethylbutane: $CH_3-CH(CH_3)-CH(CH_3)-CH_3$ $(C_6H_{14})$Since $2,3$-dimethylbutane has $6$ carbon atoms and the formula $C_6H_{14}$,it is an isomer of hexane,not pentane. Thus,option $C$ is correct.

Which of the following is not an isomer of pentane?

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