CBSE Class 10 Science 2020 Delhi Set 2

Question : 5

Total: 10

Assertion (A) : In a homologous series of alcohols, the formula for the second member is C2H5‌OH and the third member is C3H7‌OH. Reason (R) : The difference between the molecular masses of the two consecutive members of a homologous series is 144.

Both A and R are true and R is the correct explanation of the Assertion.
Both A and R are true, but R is not the correct explanation of the Assertion.
A is true, but R is false.
A is false, but R is true.

Solution:

In homologous series two consecutive members differ by −CH2 and differ in molecular masses by 14 . Thus, A is true, but R is false.

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