In which of the following pair(s), the first member is more basic than second one in aqueous solution?

C H_{3} C H_{2} N H_{2}; {(C H_{3} C H_{2})}_{2} N H

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{(C H_{3} C H_{2})}_{2} N H; {(C H_{3} C H_{2})}_{3} N

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C_{6} H_{5} N H_{2}; C H_{3} C H_{2} N H_{2}

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C_{6} H_{5} N H_{2}; C H_{3} N H_{2}

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Solution

The correct option is B ${(C H_{3} C H_{2})}_{2} N H; {(C H_{3} C H_{2})}_{3} N$
In aqueous solution, the order of basic strength of methyl amine is: $2^{\circ} > 1^{\circ} > 3^{\circ}$ and order for ethyl amine is: $2^{\circ} > 3^{\circ} > 1^{\circ}$
Also, aliphatic amines are more basic than the aromatic amines.
Considering these, the correct option is (b).

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