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Question

Which of the following is not an isomer of pentane?

A
2methylbutane
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B
2, 2- dimethylpropane
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C
npentane
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D
2,2dimethylpentane
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Solution

The correct option is D 2,2dimethylpentane
Three structural isomers are possible for pentane.
(i)

(ii) 2methylbutane

(iii) 2,2dimethylpropane

2,2dimethylpentane is an isomer of heptane since it contains seven carbon atoms in total.

Hence, the correct answer is option (d).

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