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Assertion : Order of basicity of amines ...

Assertion : Order of basicity of amines in gaseous phase of `NH_(3) gt` primary `gt` secondary `gt` tertiary.
Reason : In gaseous phase basic nature of aliphatic amines increases with increase in no. of alkly groups.

A

Both Assertion and Reason are true and reason is the correct explanation of assertion.

B

Both Assertion and Reason are true and reason is not the correct explanation of assertion.

C

Assertion is correct, Reason is incorrect

D

If Assertion is incorrect, Reason is correct

Text Solution

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All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. The base strengthening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however ,more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. Arrange the following amines in decreasing order of their basic strength