pBlock ElementsII - Result Question 1

####1. The correct statement among the following is

(2019 Main, 12 April I)

(a) (SiH3)3N is planar and less basic than (CH3)3N.

(b) (SiH3)3N is pyramidal and more basic than (CH3)3N.

(c) (SiH3)3N is pyramidal and less basic than (CH3)3N.

(d) (SiH3)3N is planar and more basic than (CH3)3N.

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Solution:

  1. The correct statement is that (SiH3)3N is planar and less basic than (CH3)3N. The compounds trimethylamine (CH3)3N and trisilylamine (SiH3)3N have similar formulae, but have totally different structures. In trimethylamine the arrangement of electrons is as follows :

In trisilylamine, three sp2 orbitals are used for σ-bonding, giving a plane triangular structure.



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