Question

Assertion:

$M_{n}ˉ $ value is always greater than $M_{w}ˉ $ value for synthetic polymers.Reason:

The mass average molecular weight of the polymer is equal to $M_{w}ˉ $.

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Correct option is D)

weight-average calculation puts equal statistical weights to each of the equal mass-fractions in the distribution, while a number-average puts equal weights to each of the equal number-fractions, and given two equal number-fractions, the one with the higher molecular mass molecules will be of a greater mass-fraction than the other

Thus, Assertion is incorrect but Reason is correct

Hence, the correct option is $D$

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