Two statements are given - One labelled as Assertion(A) and Other as the Reason(R)

Assertion(A): The molecular formula of the second and the third member of homologous series of alcohol is C2H5OH and C3H7OH

Reason(R): Two consecutive members of a homologous series have a Molecular Mass difference of 144.

According to the statements above, choose the correct option.

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Both A and R are true, in such a way that R is the correct explanation for A

Both statements(A and R) are false

A and R are true, but R can’t be used as an explanation for the assertion (A).

Statement A is correct but R is false

answer is C.

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Detailed Solution

The assertion statement molecular formula of the second and the third member of homologous series of alcohol is C2H5OH and C3H7OH but the reason statement which states that two consecutive members of a homologous series have a Molecular Mass difference of 144 is false.
The assertion statement is true because each consecutive member of a homologous series differs by the -CH2 group. In the second and third members of the homologous series of alcohol (C2H5OH and C3H7OH), there is a difference of a CH2 Group, hence the assertion is true.
The reason statement is false because as mentioned before, each consecutive member of a homologous series differs by-CH2 group and the Molecular Mass of CH2 is 14, not 144. The correct reason statement would be that two consecutive members of a homologous series have a Molecular Mass difference of 14.

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