Question
How is lithium aluminium hydride $\text{(LAH)}$ useful in organic synthesis?
✓
Answer
$i.\ \text{LAH}$ is a source of hydride $(H^–)$ and therefore, it is used as a reducing agent in organic synthesis.
For example:
$ii.$ It is useful in the preparation of $PH_3 ($phosphine$).$
$4PCl_3 + 3LiAlH_4 \rightarrow 4PH_2 + AlCl_3 + LiCl$
For example:
$ii.$ It is useful in the preparation of $PH_3 ($phosphine$).$
$4PCl_3 + 3LiAlH_4 \rightarrow 4PH_2 + AlCl_3 + LiCl$
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→a. $1.43 cm^3$
b. $458 \times 10^2 cm$
c. $643 cm^2$
d. $0.039 m$
e. $6.398 \times 10^{-3} km$
f. $0.0179 g$
g. $79,000 m$
h. $42,150$
i. $649.85$
j. $23,642,000 mm$
k. $0.0041962 kg$
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