Question

What is the major product of each of the following reactions?

Short answer

Here we have to draw the product of each reaction:

Step-by-step solution

How the reaction proceed

In this markoniv addition takes place.

Markoniv addition= Positive ion will go to that double bonded carbon which has more no of hydrogens attached and negative ion will go towards that carbon which has less number of hydrogens attached.

Methyl shift= Here in these reactions methyl shift also takes place. When the carbocation formed then to stable the carbocation methyl changes its place and form the carbocation more stable.

Final answer

The product of each reaction:

a) Markoniv addition takes place.

b) Markoniv addition takes place.

c) Methyl shift takes place and Br will attack on positive charge and attach with it.

d) Methyl shift takes place and Br will attack on positive charge and attach with it.