When vapour condenses into liquid,

Boiling water is changing into steam. The specific heat of boiling water is

The graph signifies:

Match the following items in Column-$I$ with their corresponding definitions in Column-$II$.

Column-$I$	Column-$II$
$A$. Conversion of liquid into solid is	$1$. Regelation
$B$. Conversion of liquid into vapour is	$2$. Sublimation
$C$. Conversion of solid into vapour directly is	$3$. Fusion
$D$. Melting of ice caused by pressure is	$4$. Vaporisation

$A$ solution consists of ether and $5.0 \ g$ of water at $0^{\circ} C$. If the ether evaporates completely to freeze the water, then the mass of the ether in the solution is (in $g$)

What is latent heat? Explain with an example.