How many single and double bonds are present in ethene $(C_2H_4)$? Where are they located?

Consider compounds $A$,$B$ and $C$ with following structural formulae: $A = CH_{3} - CH_{2} - CH_{2} - CH_{2} - CH_{2} - OH$,$B = CH_{2} = CH - CH_{2} - CH_{2} - CH_{3}$,$C = HO - CH_{2} - CH_{2} - CH(OH) - CH_{3}$. For the conversion of $B$ from $A$,reagent $(D)$ required is . . . . . . and structural formula of product $(E)$ obtained when $C$ undergoes same reaction using excess reagent $(D)$ is . . . . . . .

Which of the following is Baeyer's reagent?

The reaction of $HBr$ with $CH_3-C(CH_3)=CH_2$ in the presence of peroxide will give:

The volume of dihydrogen required for complete hydrogenation of $0.5 \ dm^{3}$ of ethene at $\text{S.T.P.}$ is (in $dm^{3}$)

$\underset{C_7H_{14}}{(A)} \xrightarrow[Zn/AcOH]{O_3} (B) + (C)$
Compound $(A)$ exists as geometrical isomers and $(B)$ gives the Cannizzaro reaction. $(A)$ will be: