Assertion (A) : In a homologous series of ...

CBSE Class 10 Science 2020 Delhi Set 2

Question : 5 of 10

Marks: +1, -0

Assertion (A) : In a homologous series of alcohols, the formula for the second member is

\mathrm{C}_2\mathrm{H}_5\mathrm{OH}

and the third member is

\mathrm{C}_3\mathrm{H}_7\mathrm{OH}

. 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

-\mathrm{CH}_2

and differ in molecular masses by 14 . Thus,

A

is true, but

R

is false.

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