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pK b tells the strength of a base. Lower is pK b value, stronger is the base. Now C 6 H 5 NH 2 is a weak base because the lone pair is involved in resonance with the benzene and is thus not available for a donation while in C 2 H 5 NH 2 , C 2 H 5 is an electron donating group, which increases the e- density on N thus felicitating the release of lone pair. Hence, C 2 H 5 NH 2 is a strong base. Thus, the correct order is: C 2 H 5 NH 2 < C 6 H 5 NHCH 3 < C 6 H 5 NH 2

Subject

Chemistry

Class

CBSE Class 12

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CBSE Class 12 Chemistry Solved Question Paper 2018

Short Answer Type

61.

Write the structures of the main products of the following reactions:

62.

Give a simple chemical test to distinguish between Aniline and N, N-dimethylaniline.

63.
Arrange the following in the increasing order of their pK_b values:
C₆H₅NH₂, C₂H₅NH₂, C₆H₅NHCH₃

pK_b tells the strength of a base. Lower is pK_b value, stronger is the base. Now C₆H₅NH₂ is a weak base because the lone pair is involved in resonance with the benzene and is thus not available for a donation while in C₂H₅NH₂, C₂H₅ is an electron donating group, which increases the e- density on N thus felicitating the release of lone pair. Hence, C₂H₅NH₂ is a strong base.
Thus, the correct order is: