####85. Account for the following. Write the answers in four or five sentences only.
(i) The experimentally determined bond lengths in is greater than the sum of the single bond covalent radii of and .
(ii) when reacted with water gives of but is not obtained from on reaction with water at room temperature.
(iii) is a weaker base than .
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Solution:
- (i) The size of both nitrogen and fluorine are very small as well as they have very high electron density. Thus in and repel each other stretching the bond. Hence, in , bond lengths are greater than the sum of their single bond covalent radii.
(ii)
is a salt of strong acid and strong base and therefore, not hydrolysed in aqueous solution.
(iii) In , the lone pair of nitrogen is involved in bonding, less available on nitrogen for donation to a Lewis acid, a weaker Lewis base
Carbon does not have any vacant -orbitals, no such bonding occur in trimethyl amine, lone pair of nitrogen is available for donation to Lewis acid, hence a stronger Lewis base.
