pBlock ElementsII - Result Question 116

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

(2019 Main, 12 April I)

(a) $\left(SiH _3\right) _3 N$ is planar and less basic than $\left(CH _3\right) _3 N$.

(b) $\left(SiH _3\right) _3 N$ is pyramidal and more basic than $\left(CH _3\right) _3 N$.

(c) $\left(SiH _3\right) _3 N$ is pyramidal and less basic than $\left(CH _3\right) _3 N$.

(d) $\left(SiH _3\right) _3 N$ is planar and more basic than $\left(CH _3\right) _3 N$.

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Solution:

  1. The correct statement is that $\left(SiH _3\right) _3 N$ is planar and less basic than $\left(CH _3\right) _3 N$. The compounds trimethylamine $\left(CH _3\right) _3 N$ and trisilylamine $\left(SiH _3\right) _3 N$ have similar formulae, but have totally different structures. In trimethylamine the arrangement of electrons is as follows :

In trisilylamine, three $s p^{2}$ orbitals are used for $\sigma$-bonding, giving a plane triangular structure.



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