1.

The correct order of increasing basic nature for the bases NH_3 CH_3NH_2 and (CH_3)_2 NH in aqueous solution

Answer»

`CH_3NH_2 lt NH_3 lt (CH_2)_2NH`
`(CH_3)_2NH lt NH_3 lt CH_3NH_2`
`NH_3 lt CH_3 NH_2 lt (CH_2)_2NH lt NH`
`CH_3NH_2 lt (CH_3)_2 NH lt NH_3`

Solution :If the ALKYL group 1S bigger than CH3 group there is steric hindrance to H-bonding and hence + 1 effect predominates over H-bonding `2 gt 3 gt 1`
There 18 an important role of the INDUCTIVE effect, solvation effect and steric hindrane of alkyl group. Which decide the basic STRENGTH of alkyl amine in the aqueous state. `(CH_3)_2 NH gt CH_3 OI H_2 gt NH_3`


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