Which of the following compounds has the minimum heat of hydrogenation?

Find out the major products $A$ and $B$ from the following reactions.

Which of the following alkenes gives both $cis$ and $trans$ isomers upon catalytic hydrogenation?

Reaction of $Br_2$ on ethylene in the presence of $NaCl$ gives:

The major product $(P)$ formed in the reaction below is: $HC \equiv C-CH_2-CH=CH_2 \xrightarrow[CCl_4, 253 \ K]{Br_2(1 \ mol)} P$

One mole of alkene $\underline{X}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The $IUPAC$ name of $\underline{X}$ is