Match the following if the molecular weights of X,Y and Z are the same.

Explanation

`K_(b)=(RT_(b)^(2))/(1000l_(v))=(RT_(b)^(2)M)/(1000DeltaH_(v))=(RT_(b)M)/(1000DeltaS_(v))(becauseDeltaS_(v)=(DeltaH_(v))/(T_(b)))`
Where `DeltaS_(v)` is entropyo f vaporisation at the boiling point `T_(b)`.
Entropy of vaporisation, `DeltaS_(v)=S_(v)-S_(l)` is almost constant. This is because though entropy of liquid `(S_(l))` varies from liquid to liquid but entropy of vapour `(S_(v))` is abnormally higher. As M and R are also constant, hence `K_(b) prop T_(b)`. Thus, the values reported in the table are in the correct order.