Question

what happens when Benzene reacts with methanoyl chloride in presence of Lewis acid​

Answer 1

Explanation:

We get Acetophenone (C6H5COCH3) as the major product.

Now lets see the mechanism :)

AlCl3 is considered to be a Lewis Acid or in simpler words an “electron hungry species”. So, when it sees Acetyl Chloride (CH3COCl) it extracts the -Cl minus from the latter and itself gets transformed into AlCl4 minus. Now it is quite stable because his hunger has been satisfied.

Now it leaves behind an electrophile -COCH3 minus. We all know that benzene undergoes aromatic electrophilic substitution reactions. As a result the other electrophile gets attached to the benzene ring thereby forming Acetophenone (C6H5COCH3).

AlCl3 is also a catalyst in this reaction because it gives off its Cl minus after the end of reaction and HCl is formed as bye product.

Answer 2

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The most reactive substance containing an acyl group is an acyl chloride (also known as an acid chloride). These have the general formula RCOCl. Benzene is treated with a mixture of ethanoyl chloride, CH3COCl, and aluminium chloride as the catalyst. A ketone called phenylethanone is formed.