Which of the following reactions will lead to the formation of ethyl benzene?

Options

A. `C_(6)H_(6)+CH_(3)CH_(2)Cloverset(AlCl_(3))to`
B. `C_(6)H_(6)+CH_(3)CH_(2)OHunderset(orH_(3)PO_(4))overset(BF_(3)orH_(2)SO_(4))to`
C. `C_(6)H_(6)+CH_(3)CH_(2)Ohunderset(or H_(3)PO_(4))overset(BF_(3) or H_(2)SO_(4))to`
D. All of these

Answer

4

Explanation

IN the first reaction the electrophile is the incipient
`CH_(3)overset(+)(C)H_(2)` from `CH_(3)overset(delta+)(CH_(2))…Cl….overset(delta-)(AlCl_(3))`. In the second reaction the electrophile is the incipient `CH_(3)overset(+)(C)H_(2)` from
Similarly in the third reaction the electrophile is the incipient

In this Friedel-Crafts alkylation,benzene displaces `[ClAlCl_(3)]^(-)` or `[HSO_(3)O^(-)]^(-)` or `[HOBF_(3)]^(-)` from the electrophile `C^(delta+)` to give `sigma` comples. Subsequent ejection of `H^(+)` result in the formation of `HAlCl_(4)` and ethylbenzne, `Ph-CH_(2)CH_(3)`.