Question

The degree of unsaturation in major product $(B)$ will be:

Answer 1

Answer: 4

In first step bromine is removed by $A{g}^{+}$ ion and carbocation is formed which is rearranged in six member ring. In next step, Aldol condensation reaction take place and $\alpha ,\beta$ unsaturated ketone is formed as major product. This product has two pi bonds and two cyclic ring so, it has total of 4 degree of unsaturation.
Degree of unsaturation $=4$ .