Q60 / 180 · NEET 2019 (All India) · Chemistry

The correct order of the basis strength of methyl substituted amines in aqueous solution is:

Correct answer
A
${(C H_{3})}_{2} N H > C H_{3} N H_{2} > {(C H_{3})}_{3} N$
B
${(C H_{3})}_{3} N > C H_{3} N H_{2} > {(C H_{3})}_{2} N H$
C
${(C H_{3})}_{3} N > {(C H_{3})}_{2} N H_{} > {C H}_{3} N H_{2}$
D
$C H_{3} N H_{2} > {(C H_{3})}_{2} N H > {(C H_{3})}_{3} N$

Solution

Combined effect of the inductive effect of Alkyl group $(+ I),$ steric hindrance and the salvation of Amines causes the basicity order to be Secondary Amine > Primary Amine > Tertiary Amine

${(C H_{3})}_{2} N H > C H_{3} N H_{2} > {(C H_{3})}_{3} N$

Hence, the correct answer is option: 'A'.

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