The correct order of boiling point of  ${\mathrm{NCl}}_3,{\mathrm{NClF}}_2,{\mathrm{NF}}_3$ is :

The correct order of boiling point of  ${\mathrm{NCl}}_3,{\mathrm{NClF}}_2,{\mathrm{NF}}_3$ is :

${\mathrm{NCl}}_3>{\mathrm{NClF}}_2>{\mathrm{NF}}_3$,

The boiling point of NH3 is higher (–33˚C)  while the boiling point of NCl3 (71˚C) is lower.