First slide

13th group or boron group

Question

In the reaction
$2 X + B_{2} H_{6} \to {[B H_{2} X_{2}]}^{+} {[B H_{4}]}^{-}$
Which of the following is not X?

Difficult

A

$N H_{3}$
B

$C H_{3} N H_{2}$
C

${(C H_{3})}_{2} N H$
D

${(C H_{3})}_{3} N$

Solution

${(C H_{3})}_{3} N$ does not have H-atom attached to N-atom, hence it can not form $B {H^{-}}_{4}$ ion. It causes symmetrical cleavage of the diborane molecule.

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