Which of the following statements are correct?(I). A pair of positional isomers differs in the position of the same functional group.(II). A pair of structural isomers have the same relative molar mass.(lII). A pair of functional group isomers belongs to different homologous series.
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a
II and III
b
I and III
c
I and II
d
I, II and III
answer is C.
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Detailed Solution
Positional isomers differ in position of same functional group on parent chain. Isomers have same molecular formula, hence same molar mass. In homologous series, compounds are differ by -CH2 group. Hence it is not related to isomers.