p-Block Elements-I 1 Question 15
15. In the reaction, $2 X+\mathrm{B} _{2} \mathrm{H} _{6} \longrightarrow\left[\mathrm{BH} _{2}(X) _{2}\right]^{+}\left[\mathrm{BH} _{4}\right]^{-}$ the amine(s) $X$ is/are
(2009)
(a) $\mathrm{NH} _{3}$
(b) $\mathrm{CH} _{3} \mathrm{NH} _{2}$
(c) $\left(\mathrm{CH} _{3}\right) _{2} \mathrm{NH}$
(d) $\left(\mathrm{CH} _{3}\right) _{3} \mathrm{N}$
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Answer:
Correct Answer: 15. (a,b,c)
Solution:
- Diborane $\left(\mathrm{B} _{2} \mathrm{H} _{6}\right)$ undergoes unsymmetric cleavage with $\mathrm{NH} _{3}$, primary and secondary amine while tertiary amine brings about symmetrical cleavage of $\mathrm{B} _{2} \mathrm{H} _{6}$ as :
