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The increasing order of K (b) for the fo...

The increasing order of `K _(b)` for the following compounds will be:
`H _(2) N- overset(NH) overset(||) underset(I)(C)-NH_(2), CH_(3) -overset(NH) overset(||)underset(II) (C)-NH_(2), underset(III)(CH_(2))-NH_(2)`

A

`III lt I lt II`

B

`I lt II lt III`

C

`III lt II lt I`

D

`II lt I lt III`

Text Solution

Verified by Experts

The correct Answer is:
C
`H_(2)N-overset(NH)overset(||)(C)-NH_(2)` : Guanidine type strongest organic base, conjugate acid is highly stabilised by resonance structures.
`CH_(3)-overset(NH)overset(||)(C)-NH_(2)` : also guanidine type but less resonance stabilization of conjugation acid
`CH_(3)-overset(II)(CH_(2))-NH_(2)` : aliphatic amine conjugate acid is not stabilized by resonance order of `K_(b)` values `III lt II lt I`
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