$2-$butyne is reduced to $trans-but-2-ene$ using:

What are $X$ and $Y$ respectively in the following reaction?
$Z$-product $\stackrel{Y}{\longleftarrow} 2$-butyne $\stackrel{X}{\longrightarrow} E$-product

Which alkyne will give $3$-ethylhexane on catalytic hydrogenation?

The reagent which is used to distinguish between propene and propyne is

Which of the following is used to distinguish ethylene and acetylene?

The product $(B)$ of the reaction is:
$CH(CO_2H)=CH(CO_2H)$ $\xrightarrow[2 \ mole]{NaOH} (A)$ $\xrightarrow{\text{electrolysis}} (B)$