In the given reaction

the number of sp2 hybridised carbon(s) in compound ‘X’ is _____.
The correct answer is 8

Note that phenyl ring has sp2 carbons as well.

How many molecules are secondary alcohol? 

Alcohol is a derivative of water (H2O) that has one, two, or more hydroxyl groups that are attached to a carbon atom of a hydrocarbon chain (an alkyl group). It is one of the most common organic compounds used in sweeteners, fragrances, and medicine.
Read More: Types of Alcohol