In the catalytic reduction of hydrocarbons,which catalyst is mostly used?

$Propanal$ and $pentan-3-one$ are ozonolysis products of:

The major product of this reaction is:

In the given reaction,only one alkene undergoes preferential oxidation by electrophilic ozone. Identify the product $(P)$ of the given reaction.

Which of the following is correct regarding the heat of hydrogenation?

Baeyer's reagent is ....