This conversion can be achieved by:

Identify the structures of $P$ and $Q$ in the following reaction sequence:

Give reactions that show the hydrohalogenation and hydration of alkynes. Write a note on the addition of hydrogen halides and water to alkynes.

Which of the following catalyst/reagent is used to convert $C \equiv C$ triple bond to $C = C$ double bond to form $cis$ isomer of alkene?

The trend in acidic behaviour of the following hydrocarbons is:
$a: HC \equiv CH$
$b: CH_2 = CH_2$
$c: CH_3 - CH_3$
$d: CH_3 - C \equiv CH$

$A$ salt-producing hydrocarbon among these compounds is