How much carbon monoxide diffuses in the same time under similar conditions of temperature and pressure in which 100 cc of ${\mathrm{C}}_2{\mathrm{H}}_4 \mathrm{diffues}$

Molar mass of ${\mathrm{C}}_2{\mathrm{H}}_4 \mathrm{is} 28$

Molar mass of CO is 28 

Both are having same M.Wt so same amount of volume of gas diffuses

${\mathrm{V}}_1=100 \mathrm{mL}$

Hence volume of both gases are equal i.e. 100 cc.