1.

The correct order of basicity of the following compouds is

Answer»

`1 lt 2 lt 3 lt 4 `
`1 lt 2 lt 4 lt 3 `
`2 lt 1 lt 3 lt 4 `
`4 lt 3 lt 2 lt 1`

Solution :A few POINTS should be considered before answering this type of questions :
(i) Donation capacity of nitrogen increases if electron donating GROUP(s) (+/ or +R-effect CONTAINING) is/arc attached with it.
(ii) More nitrogen atoms (or donor atoms) means more BASICITY (in general).
(iii) `sp^(2)`-hybridiscd nitrogen is less capable of donating lone pair than `sp^(3)` -hybridised. Now, look into the structures individually.



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