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Calculate the difference in the molecula...

Calculate the difference in the molecular formulae and molecular masses for:
(a) `CH_(3)OH "and" C_(2)H_(5)OH`
(b) (a) `C_(2)H_(5)OH "and" C_(3)H_(7)OH`
(c )(a) `C_(3)H_(7)OH "and" C_(4)H_(7)OH`
(i) Is there any similarity in these three?
(ii) Arrange these alcohols in the order of increasing crbon atoms to get a family . Can we call this family a homologous series?

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