Assertion (A): The molecular mass of polymers cannot be calculated using the boiling point or freezing point method.
Reason (R ): The boiling point method for determining the molecular masses is used for compounds stable at high temperature.

Options

A. If both `(A)` and `(R )` are correct, and `(R )` is the correct explanation of `(A)`.
B. If both `(A)` and `(R )` are correct, but `(R )` is not the correct explanation of `(A)`.
C. If `(A)` is correct, but `(R )` is incorrect.
D. If `(A)` is correct, but `(R )` is correct.

Answer

A

Explanation

Learn as a fact. The molecular mas of large molecules is determined using the osmotic pressure technique. The molecular mass of smaller molecules is determined using the freezing point lowering method.