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13.4     Arrange the following in increasing order of their basic strength:

                 (iii)  CH_{3}NH_{2}, (CH_{3})_{2}NH, (CH_{3})_{3}N, C_{6}H_{5}NH_{2}, C_{6}H_{5}CH_{2}NH_{2}.

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On considering the inductive effect, solvation effect and steric hindrance of the alkyl group which decides the basic strength of alkyl amines in the aqueous state. The order of basic strength in case of methyl substituted amines are - 

C_{6}H_{5}NH_{2}<C_{6}H_{5}CH_{2}NH_{2}<(CH_{3})_{3}N<CH_{3}NH_{2}<(CH_{3})_{2}NH

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