The number of secondary carbon atoms present in the following compounds are respectively:

How many secondary carbon and hydrogen atoms are present in the molecule $CH_3-CH(Br)-CH(Br)-CH_3$ respectively?

The enolic form of acetone contains ................

Given below are two statements:
Statement-$I$ : Compound $(X)$,shown below,dissolves in $NaHCO_3$ solution and has two chiral carbon atoms.
Statement-$II$ : Compound $(Y)$,shown below,has two carbons with $sp^3$ hybridization,one carbon with $sp^2$ and one carbon with $sp$ hybridization.
In the light of the above statements,choose the correct answer from the options given below:

The least acidic compound among the following is:

How many functional groups are present in the following molecule?