Question

$LiAl{H}_4$ is obtained by reacting an excess of ___ with an ethereal solution of $AlC{l}_3$:

• A. $LiCl$
• B. $LiH$
• C. $Li$
• D. $LiOH$

Answer 1

Answer: (B)

$LiH$

$4LiH+AlC{l}_3⟶LiAl{H}_4+3LiCl$

Idustrially, first sodium aluminium hydride is prepared fom the elements
under high temperature and high pressure:

$Na+Al+2H_2⟶NaAl{H}_4$

Using salt metathesis,
$NaAl{H}_4+LiCl⟶LiAl{H}_4+NaCl$