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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl164

Select all the correct statements about determination of molar mass of polymers.

ATitration of the end groups of a linear polymer gives $M_{n}$
BMembrane osmometry gives $M_{n}$ because osmotic pressure depends on the number of chains
CLight scattering gives $M_{w}$ because heavier chains scatter more strongly
DVapour pressure osmometry gives $M_{w}$

Answer: A, B, C

Osmotic pressure, vapour pressure lowering and end-group counts all count molecules and give

M_{n}

. Scattered intensity grows with the square of chain mass per unit concentration, so light scattering gives

M_{w}

.

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