Consider the following transformations of a compound $\mathrm{P}$.

Choose the correct option(s).

Total number of hydroxyl groups present in a molecule of the major product $\mathrm{P}$ is ______

 

Compound P and R upon ozonolysis produce Q and S, respectively. The molecular formula of Q and S is ${\mathrm{C}}_8{\mathrm{H}}_8\mathrm{O}$ . Q undergoes Cannizzaro reaction but not haloform reaction, whereas S undergoes haloform reaction but not Cannizzaro reaction.

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Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure.

The correct order of their boiling point is