Question

Which of the following statements is/are correct for the given reactions?
$\left(I\right)BeC{l}_2+LiAl{H}_4\to Be{H}_2+A+AlC{l}_3$
$\left(II\right)BeC{l}_2+Li\left[B{H}_4\right]\to A+B$
$\left(III\right)B+PP{h}_3\stackrel{\Delta }{\to }C+P{h}_{3}PB{H}_3$

• A. Here $A$ is $LiCl$
• B. $B$ is $Be{B}_2{H}_8$
• C. $C$ is $Be{H}_2$
• D. Product $C$ is impure

Answer 1

Answer: (A), (B), (C)

The correct options are
A Here $A$ is $LiCl$
B $B$ is $Be{B}_2{H}_8$
C $C$ is $Be{H}_2$

The complete reactions are,
$2BeC{l}_2+LiAl{H}_4\to 2Be{H}_2+\underset{A}{LiCl}+AlC{l}_3$
$BeC{l}_2+2Li\left[B{H}_4\right]\to 2LiCl+\underset{B}{Be{B}_2{H}_8}$
$Be{B}_2{H}_8+2PP{h}_3\stackrel{\Delta }{\to }Be{H}_2+2P{h}_{3}PB{H}_3$

$Be{H}_2$ obtained from the reaction $\left(III\right)$ is pure, but the one obtained from $Be{H}_2$ from the reaction ($I$) is not pure.