The solution containing \[4.0gm\] of a polyvinyl chloride polymer in 1 litre of dioxane was found to have an osmotic pressure \[6.0\times {{10}^{-4}}\] atmosphere at\[300K\], the value of R used is 0.082 litre atmosphere\[mol{{e}^{-1}}{{k}^{-1}}\]. The molecular mass of the polymer was found to be [NCERT 1978]

• A.                 \[3.0\times {{10}^{2}}\]   
• B.                 \[1.6\times {{10}^{5}}\]
• C.                 \[5.6\times {{10}^{4}}\]   
• D.                 \[6.4\times {{10}^{2}}\]