Question

Assertion:
value is always greater than  value for synthetic polymers.

Reason:
The mass average molecular weight of the polymer is equal to .

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C

Assertion is correct but Reason is incorrect

D

Assertion is incorrect but Reason is correct

Medium

Solution

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Correct option is D)

, the number average molecular weight, is calculated from the mole fraction distribution of different sized molecules in a sample, and , the weight average molecular weight, is calculated from the weight fraction distribution of different sized molecules.

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

Solve any question of Polymers with:-

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