1.

The structure of isobutyl group in an organic compound isA. (1) `CH_(3)-underset(|)(CH)-CH_(2)-CH_(3)`B. (2) `CH_(3)-CH_(2)-CH_(2)-CH_(2)-`C. (3) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C )-`D. (4)

Answer» The prefix iso always describes the following structural unit:
`CH_(3)-underset(CH_(3))underset(|)(CH)-`
which is present only in fourth alkyl group:
`CH_(3)-underset(Isobutyl)underset(CH_(3))underset(|)(CH)-CH_(2)-`


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