A) \[{{C}_{2}}{{H}_{6}}\]
B) \[{{C}_{2}}{{H}_{4}}\]
C) \[C{{H}_{4}}\]
D) All of these diffuse at equal rate
Correct Answer: A
Solution :
Key Idea: According to Graham's law \[r\propto \frac{1}{\sqrt{M}}\] \[\therefore \]Greater the molecular mass, lesser will be rate of diffusion. [a] \[{{C}_{2}}{{H}_{6}}-\]molecular mass \[=2\times 12+1\times 6=30\] [b] \[{{C}_{2}}{{H}_{4}}-\] molecular mass\[=2\times 12+1\times 4=28\] [d] \[C{{H}_{4}}-\] molecular mass \[\because \]\[{{C}_{2}}{{H}_{6}}\] has highest molecular mass \[\therefore \]Rate of diffusion is least forC2H6.
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