Q. The structure of isobutyl group in an organic compound is

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$CH_{3}-\overset{\left|\right.}{C H}-CH_{2}-CH_{3}$

$CH_{3}-CH_{2}-CH_{2}-CH_{2}-$

$\left(\right.CH_{3}\left(\left.\right)_{3}C-$

$\left(\right.CH_{3}\left(\left.\right)_{2}CH-CH_{2}-$

Solution:

$CH_{3}-\overset{\left|\right.}{C H}-CH_{2}-CH_{3}$ (Secondary butyl)
$CH_{3}-CH_{2}-CH_{2}-CH_{2}-$ (Normal butyl)
$\left(\right.CH_{3}\left(\left.\right)_{3}C-$ (Tertiary butyl)

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