1.

Which of the foil owing is most basic?

Answer»

`CH_(3)CH_(2)NH_(2)`
`CH_(3)CONH_(2)`
`C_(6)H_(5)CONHCH_(3)`
`NH_(2)NH_(2)`

Solution :In OPTION (d) due to /-effect of `NH_(2)` group, the electron DENSITY on the other N-atom decreases. As a result, `NH_(2)NH_(2)` is a much weaker base than `NH_(3)` and aliphatic amines. Further in options (b) and (c), due to -R-effecr of the C = O group, the electron-density on the N-atom decreases. As a result, amides are much weaker BASES than `NH_(3)` and aliphatic amines. Thus, cthylaminc is most basic, i.e. , option (a) is correct.


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