Explain the mechanism of the following reactions:
a) Addition of bromine and ethylene.
b) Addition of HBr on ethylene.
c) Dehydration of an alcohol.
d) Addition of HBr on buta-1,3-diene.
e) Addition of HCl on 3,3-dimethylbut-1-ene.

Explain the mechanism of the following reactions : (i) Sulphonation of benzene (ii) Addition of HBr to ethene.

Addition of HBr to but -1- ene yields

Addition of bromine to buta-1,3-diene gives:

Explain a suitable mechanism for the following addition of HBr to hexa-2, 4-diene.

Explain the reaction mechanism of the addition of bromine on acetylene by equations only.

Explain the reaction mechanism of the addition of HBr on acetylene by equations only.

Which of the following statements are correct about the addition of HBr to buta-1,3-diene ?

Which of the following will be most reative in the addition reaction with HBr?

Explain the mechanism of the following reactions : (i) Addition of Grignard reagent to a carbonyl compound forming an adduct followed by hydrolysis. (ii) Acid catalysed dehydration of alcohol forming an alkene. (iii) Acid catalysed hydration of an alkene forming an alcohol.