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

Options

A. `A gt B gt C`
B. `A gt C gt B`
C. `C gt A gt B`
D. `C gt B gt A`

Answer

C

Explanation

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`