Question

In which of the following combination, hydridisation of central atom (underlined) changes :
(a) $\underset{–}{B}{H}_3+H^{\ominus }$
(b)$\underset{–}{B}(OH{)}_3+O{H}^{\ominus }$
(c)$\underset{–}{B}{F}_3+N{H}_3$
(d)$\underset{–}{S}{O}_4^{2-}+H^{\ominus }$

• A. a, b, c
• B. b, c, d
• C. a, b, d
• D. a, c, d

Answer 1

The correct option is A a, b, c

a) $\underset{s{p}^2}{B}{H}_3+H^{-}\to \underset{s{p}^3}{B}{H}_4^{-}$

b) $H_3\underset{s{p}^2}{B}{O}_3\to \underset{s{p}^3}{B}(OH{)}_4^{-}$

c) $\underset{s{p}^2}{B}{F}_3+N{H}_3⟶H_{3}N:\to B{F}_3=\stackrel{+}{N}{H}_3\underset{s{p}^3}{B}{F}_3$

d) $\underset{s{p}^3}{S}{O}_4^{2-}+H^{+}\to H\underset{s{p}^3}{S}{O}_4^{-}$