Question

In which of the following reaction t-butylbenzene is formed :

• A. Benzene+iso-butyl chloride, $AlC{l}_3$
• B. Benzene+$(C{H}_3{)}_{2}C=C{H}_2\stackrel{B{F}_3.HF}{\to }$
• C. Benzene+t-butyl alcohol$\stackrel{H_{2}S{O}_4}{\to }$
• D. Benzene$+(C{H}_3{)}_{2}C=C{H}_2\stackrel{AlC{l}_3}{\to }$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Benzene+iso-butyl chloride, $AlC{l}_3$
B Benzene+$(C{H}_3{)}_{2}C=C{H}_2\stackrel{B{F}_3.HF}{\to }$
C Benzene+t-butyl alcohol$\stackrel{H_{2}S{O}_4}{\to }$
D Benzene$+(C{H}_3{)}_{2}C=C{H}_2\stackrel{AlC{l}_3}{\to }$

The replacement of a hydrogen atom in benzene by alkyl group can be brought about with alkyl chloride in presence of anhydrous aluminum chloride. The reaction is known as Friedel carfts alkylation reaction.
An alkene and $B{F}_3.HF$ can also be used.
This can also be carried out by using alkene and aluminium chloride or alkanol and acid.
Thus t-butylbenzene can be prepared by using following reactions.