1.

The correct order of basic strength of CH_(3)NH_(2)(I),(CH_(3))_(2)NH(II),(CH_(3))_(3)N(III),C_(6)H_(5)CH_(2)(IV) in gaseous phase is

Answer»

`IV lt III lt II lt I`
`IV lt III lt I lt II`
`I lt II lt III lt IV`
`IV lt I lt II lt III`

Solution :In the gaseous phase, basicity INCREASES as the +I-effect of the ALKYL groups increases, i.e., `CH_(3)NH_(2)(I) lt (CH_(3))_(2) NH lt (CH_(3))_(3) N (III).` However, due to -I-effect of the `C_(6)H_(5)-` group, `C_(6)H_(5)CH_(2)NH_(2)(IV)` is EVEN a weaker base than `CH_(3)NH_(2)(I)`. thus, the overal , basic character increases in the order: `IV lt I lt II lt III`.


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