Addition of $OsO_4$ to cyclopentene would give a product which is

The major product of the reaction is:

Consider the following sequence of reactions: $CH_3-CH=CH_2$ $\xrightarrow[700\,K]{Cl_2} A$ $\xrightarrow[420\,K, 12\,atm]{Na_2CO_3} B$ $\xrightarrow[(ii) NaOH]{(i) HOCl} C$. Compound $C$ is:

Molar mass of the hydrocarbon $(X)$ which on ozonolysis consumes one mole of $O_3$ per mole of $(X)$ and gives one mole each of ethanal and propanone is $...... g\ mol^{-1}$ (Molar mass of $C: 12\ g\ mol^{-1}, H: 1\ g\ mol^{-1}$)

What is the product of the following reaction?
$H_2C=C_6H_{10}=CH_2 + HBr \xrightarrow{\text{peroxide}} ?$

Propene on treatment with $HBr$ gives