Hydrolysis of ozonide of $but-1-ene$ gives

What is the product of the following reaction?

An alkene $A$ (molecular formula $C_{5}H_{10}$) on ozonolysis gives a mixture of two compounds $B$ and $C$. Compound $B$ gives a positive Fehling's test and also forms iodoform on treatment with $I_{2}$ and $NaOH$. Compound $C$ does not give Fehling's test but forms iodoform. Identify the compounds $A, B$ and $C$. Write the reaction for ozonolysis and the formation of iodoform from $B$ and $C$.

Alkenes usually show which type of reaction?

$O_3$ reacts with $CH_2 = CH_2$ to form an ozonide. On hydrolysis,it forms:

Which $\pi$-bond will be reduced first when the compound shown below undergoes catalytic hydrogenation?