JEE MAIN - Chemistry (2019 - 12th April Morning Slot - No. 3)
The correct statement among the following is :
(SiH3)3N is planar and more basic than (CH3)3N
(SiH3)3N is pyramidal and more basic than (CH3)3N
(SiH3)3N is pyramidal and less basic than (CH3)3N
(SiH3)3N is planar and less basic than (CH3)3N
Explanation
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In (CH3)3N, one lone pair and 3 sigma bond present. So it's shape is pyramidal.
But in (SiH3)3N, due to backbonding lone pair of N shift to vacant 3d orbital of Si. So now N have only 3 sigma bond and hybridization is sp2, that is why it has triangular planar geometry.
As in (SiH3)3N. nitrogen(N) don't have any lone pair to donate but in (CH3)3N, lone pair of nitrogen(N) can easily be donated. That is why (CH3)3N is more basic.
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