Which one of the following gases contain the least number of molecules ?

$\left(\mathrm{At} \mathrm{Wt} \mathrm{of} \mathrm{p}=31,\mathrm{Cl}=35.5,\mathrm{N}=14,\mathrm{O}=16, \mathrm{C}=12,\mathrm{H}=1\right)$

Laughing gas $\left({\mathrm{N}}_2\mathrm{O}\right)=\mathrm{no}.\mathrm{of} \mathrm{moles} \mathrm{of} {\mathrm{N}}_2\mathrm{O}=\frac{4}{44}=\frac{1}{11} \mathrm{moles}$No. of moles of phoshine of $\left({\mathrm{PH}}_3\right)=\frac{3}{34}=\frac{1}{11.3}moles$

No. of moles of Marsh gas $\left({\mathrm{CH}}_4\right)=\frac{2}{16}=0.125=\frac{1}{8}moles$

No. of moles of phosgene $\left({\mathrm{COCl}}_2\right)=\frac{10}{109}=\frac{1}{11} moles$