Question

The product obtained by reduction of benzyl bromide with \[{\text{LiAl}}{{\text{H}}_4}\] is
A)

B)

C)

D)

Answer 1

Hint:
An aromatic is formed out of reduction. The compound formed is colourless and water insoluble liquid. It is a mono substituted benzene derivative.

Complete step by step solution:
The reduction represents the addition of hydrogen in a molecule. When reduction of benzyl bromide in the presence of lithium aluminium hydride adds up the hydrogen in the methyl group and the formation of toluene occurs the reaction occurs as follow:

Hence, the correct option is C.

Additional information:
Lithium aluminium hydride is commonly known as LAH. It is an inorganic gray coloured solid. It is a very strong reducing agent. It is extensively used for the reduction of esters, carboxylic acid and amide. It reacts dangerously with water releasing hydrogen. It is a potential source for storage of hydrogen gas. Benzyl bromide is an organic compound. In benzyl bromide one hydrogen atom in the benzene ring is substituted with bromo methyl group. It is a colourless liquid. It is used in the organic synthesis of various benzyl derivatives. Toluene is used for various reactions such as nitration and oxidation. It is used as a solvent for paint, paint thinner and many chemical reactions, printing inks, adhesives, liquors and disinfectants. Toluene is also used as a fuel or as an additive in fuel.

Note:
Reduction and oxidation are simultaneous processes. If one substance is getting reduced then another substance will be getting oxidised for sure. For example the reduction of benzyl bromide occurs due to the addition of hydrogen, then simultaneously lithium aluminium hydride is getting oxidised.