Explanation

(d)
The possible primary amine with the formula $C_{4}H_{11}N$ are
(i) $CH_{3}CH_{2}CH_{2}CH_{2}NH_{2}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |$
(ii) $CH_{3} - CH - CH_{2} - NH_{2}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$
|
(iii) $CH_{3} - C - CH_{3}$
|
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ NH_{2}$
(iv) $CH_{3} - CH_{2} - CH - NH_{2}$
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$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$