The common and IUPAC names of the group of $(C H_{3})_{2} C H C H_{2} -$ respectively are :

Isobutyl, 2 - Methylpropyl

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Isobutyl, 1 - Methylpropyl

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Tert-butyl, 1, 1 - Dimethylethyl

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Sec-butyl, 2 - Methylpropyl

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Solution

The correct option is A Isobutyl, 2 - Methylpropyl
Here longest chain contains 3 carbon in which one methyl group is attached to carbon at position 2. Therefore, its common name is isobutyl and IUPAC is methylpropyl.

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