Question

Benzene reacts with propylene in presence
of Levis acid BF3
give​

Answer 1

Answer:

here it is look attachment

Explanation:

Answer 2

No reaction if propylene is present.

Explanation:

This reaction will not take place.

For the reaction to take place, first propylene needs to be converted to propyl chloride by reaction with chlorine (chlorination).

Then, the so-formed propyl chloride can react with benzene in presence of the Lewis acid, B$F_3$ to give the Friedal Crafts alkylation reaction, generating propyl benzene.

The chemical reaction will be as follows:

$CH_3CH=CH_2 + HCl \rightarrow CH_3CH(Cl)CH_3$

$C_6H_6 + CH_3CH(Cl)CH_3\rightarrow C_6H_5CH(CH)_2$

or

$C_6H_6 + CH_3CH_2CH_2Cl\rightarrow C_6H_5CH_2CH_2CH_3$