Polysubsititution is a major drawback in:

  • Option 1)

    Friedel Carft's alkylation

  • Option 2)

    Reimer Tiemann reaction

  • Option 3)

    Acetylation of aniline

  • Option 4)

    Friedel Carft's acylation

Answers (1)

Friedel carft's alkylation

                                

P+O- substituted products are formed  (Two e-releasing groups) Reactivity further increases.

In alkylation 

r_{1}<r_{2}<r_{3}

as reactivity is continuously increasing due to the substitution of alkyl group in benzene ring no monosubstituted product is formed 

P.S. is drawback


Option 1)

Friedel Carft's alkylation

Option 2)

Reimer Tiemann reaction

Option 3)

Acetylation of aniline

Option 4)

Friedel Carft's acylation

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