What is the use of $Baeyer's$ reagent in the laboratory?

$A$ hydrocarbon containing $2$ carbon atoms gives Sabatier and Senderen's reaction but does not give a precipitate with ammoniacal silver nitrate solution. The hydrocarbon is:

Consider the following molecule $(X)$. The reaction of $(X)$ with $HBr$ gives the major product:

$CH_3-CH=CH_2 + NOCl \rightarrow P$
Identify the adduct.

An optically active compound $A$ with molecular formula $C_8H_{14}$ undergoes catalytic hydrogenation to give a meso compound. The structure of $(A)$ is:

An alkene $'A'$ contains three $C-C$,eight $C-H$ $\sigma$ bonds and one $C-C$ $\pi$ bond. $'A'$ on ozonolysis gives two moles of an aldehyde of molar mass $44 \ u$. Write the $IUPAC$ name of $'A'$.