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  • Justify that the following reactions are redox reactions 4BCl3(g) + 3LiAlH4(s) → 2B2H6(g) + 3LiCl(s) + 3 AlCl3(s)

8.3 Justify that the following reactions are redox reaction

(c) 4BCl_{3}_{(g)}+3LiAlH_{4}_{(s)}\rightarrow 2B_{2}H_{6}_{(g)}+3LiCl_{(s)}+3AlCl_{3}_{(s)}

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Solution-

Let us write the O.N of each element

4\overset{+3\:\:-1}{BCl_{3}}\:\:+\:3\overset{+1\:\:+3\:\:-1}{LiAlH_{4}}\:\rightarrow\:2\overset{-3\:\:+1}{B_{2}H_{6}}\:\:+\:\:3\overset{+1\:-1}{LiCl}\:\:+\:3\overset{+3\:-1}{AlCl_{3}}

Here, the O.N. of Fe decreases from +3 in BCl3 to -3 in B2H6. And the O.N. of H increases from -1 in LiAlH_{4} to +1 in B_{2}H_{6}. Hence, it is a redox reaction.

 

Posted by

Gautam harsolia

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