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Question

Which amongst the following is a positional isomer of CH3CH2CH=CH3

A
CH3CH2CH2CH3
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B
CH3CH=CH3
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C
CH3CH=CHCH3
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D
CH3CCCH3
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Solution

The correct option is C CH3CH=CHCH3
CH3CH=CHCH3 and CH3CH2CH=CH3 are position isomers as they have the same molecular formula (C4H9) and the only difference is in the position of unsaturation. The IUPAC name of first compound is but-2-ene while that of the second compound is butene.

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