The gas liberated at the anode by the electrolysis of a concentrated aqueous solution of dipotassium succinate is:

Which hydrogen in compound $(E)$ is easily replaceable during bromination reaction in the presence of light?
$CH_3 - CH_2 - CH = CH_2$
$(E)$

An alkene $A$ on reaction with $O_{3}$ and $Zn-H_{2}O$ gives propanone and ethanal in equimolar ratio. Addition of $HCl$ to alkene $A$ gives $B$ as the major product. The structure of product $B$ is:

What is the major product formed by the reaction of $2$-methylpropene with $HBr$?

An alkene $(X)$ on ozonolysis gives propanal and ethanal. What is $X$?

What are $X$ and $Y$ in the following reaction?
Pent-$2$-ene $\xrightarrow[(ii) Zn / H_2O]{(i) O_3} X + Y$