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 Grahams 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 \[=\,2\times 12+1\times 4=28\] [c] \[C{{H}_{4}}-\]molecular mass \[=12+1\times 4=16\] \[\because \]has highest molecular mass \[\therefore \]Rate of diffusion is least for \[{{C}_{2}}{{H}_{6}}.\]
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