Question

$B_2{H}_6$ undergoes substitution reaction with:

• A. $B{r}_2$ at ${100}^{o}C$
• B. $HCl$ $/$anhydrous $AlC{l}_3$
• C. both A and B
• D. $C{l}_2$ at ${100}^{o}C$

Answer 1

Answer: (C)

$B_2{H}_6+HCl\to B_2{H}_{5}Cl+H_2$
This reaction takes place in the presence of anhydrous $AlC{l}_3$.
$B_2{H}_6+B{r}_2\to B_2{H}_{5}Br+HBr$
This is a slow reaction taking place at ${100}^{o}C$.
$B_2{H}_6+6C{l}_2\to 2BC{l}_3+6HCl$
This is a vigorous reaction taking place at ${25}^{o}C$. Diborane does not react with $C{l}_2$ at ${100}^{o}C$. This reaction is not reported.