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The correct order of basicities of PhNH(...

The correct order of basicities of `PhNH_(2)(A),` and `Ph_(2)NH(B)` and cyclohexyl`-NH_(2)(C)` is

A

`A gt B gt C`

B

`A gt C gt B`

C

`C gt A gt B`

D

`C gt B gt A`

Text Solution

Verified by Experts

The correct Answer is:
C
Substitution of H-atoms of the `-NH_(2)` group of `1^(@)` arylamines by electron withdrawing groups (such as phenyl group) decreases the basicity. Order of basicity :
`underset((A))(C_(6)H_(5)NH_(2)) gt underset((B))((C_(6)H_(5))_(2)NH`
The lone pairs of N are not involved in delocalization in cyclohexylamine (C), hence it has highest basicity.
`therefore` Order of basicity `C gt A gt B`
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