Question

Which of the following reaction is not feasible?

• A. Only P, Q are not feasible reactions
• B. Only P, S are not feasible reactions
• C. Only Q, R are not feasible reactions
• D. Only Q, S are not feasible reactions

Answer 1

The correct option is B Only P, S are not feasible reactions

A Friedel-Crafts alkylation reaction is an electrophilic aromatic substitution reaction in which a carbocation attacks an aromatic ring with the net result that one of the aromatic protons is replaced by an alkyl group.

Reason:-

1. Vinyl and aryl halides cannot be used to form carbocations, in option $S$ aryl halide is used.

2.Friedel-Crafts reactions cannot be performed when the aromatic ring contains a $N{H}_2$, $NHR$, or$N{R}_2$ substituent in option $P$, $N{H}_2$ is present at the aromatic ring.