Question

The major reaction of the unsaturated compounds is:

Answer 1

Its B addition

where an atom adds to the broken double bond of a hydrocarbon and saturates it 

hope that helps

Answer 2

I think the correct answer among the choices presented is option B. The major reaction of the unsaturated compounds is addition. This type of reaction is a reaction in wherein one molecule combined with another molecule forming a larger molecule and no other products.