Ethylene is a member of the $.....$ series.

Consider the following statements: $A$ hydrocarbon of molecular formula $C_5H_{10}$ is a
$I.$ monosubstituted alkene
$II.$ disubstituted alkene
$III.$ trisubstituted alkene
Which of the following statement$(s)$ is(are) correct?

Predict the product$(s)$ obtained for the following reaction:
$3$-methylcyclopentene + $Br_2 / CCl_4 \rightarrow ?$

What is the product of the following reaction?

The major product of the following reaction is $F_3C-CH=CH_2 + HBr \rightarrow$

The gas evolved by the reaction of ethyl iodide with alcoholic $KOH$,which decolorizes basic $KMnO_4$ solution,is........