Neet PYQ 2007

Which one of the following ionic species has the greatest proton affinity to form stable compound?

${\text{CH}}_3{\text{—CHCl—CH}}_2{\text{—CH}}_3$ has a chiral center. Which one of the following represents its $R$ configuration?

$0.5\text{ molal}$ aqueous solution of a weak acid ($\text{HX}$) is $20\%$ ionised. If $K_f$ for water is $1.86{\text{ K kg mol}}^{-1}$, the lowering in freezing point of the solution is:

Which one of the following polymers is prepared by condensation polymerization?

The Langmuir adsorption isotherm is deduced using the assumption: