Increasing order (least basic first) of basic strength is shown by the set :

C l N H_{2}

N H_{3}

C H_{3} N H_{2}

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C l N H_{2}

C H_{3} N H_{2}

N H_{3}

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N H_{3}

C l N H_{2}

C H_{2} N H_{3}

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C H_{3} N H_{2}

C l N H_{2}

N H_{3}

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Solution

The correct option is A $C l N H_{2}$ , $N H_{3}$ , $C H_{3} N H_{2}$
$C H_{3}$ group has electron releasing inductive effect $(+ I)$ , increases ease to give electrons by $N H_{2}$ so, it is a strong base. Oppositely $C l$ is a electron withdrawing group and do not avail to give electrons by $N H_{2}$ group therefore is a weak base. Hydrogen's inductive effect is zero, therefore the basic strength is in order $C l N H_{2} < N H_{3} < C H_{3} N H_{2}$

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