Question

the molecular weights of consecutive members of _ carbon compounds differ by 14 units

Answer 1

The answer should be - Homologous series.

The molecular weights of consecutive members of "Homologous series" carbon compounds differ by 14 units.

In organic chemistry, a homologous series is a series of compounds with the same general formula, usually varying by a single parameter which can be the length of a carbon chain.

In alkanes (CnH₂n+₂), the two consecutive members will differ by 14 units or CH₂ units. Example, Example methane, ethane, propane - CH₄, C₂H₆, C₃H₈ have molecular masses of 16, 30, 44 respectively.

Answer 2

A series of organic compound in which every succeeding member differ from the previous one by -CH2 or 14 a.m.u is called homologous series. The molecular formula of all the homologous series can be derived from a general formula.

General formula for alkanes : CnH2n+2
E.g of alkanes: Methane (CH4), Ethane ( C2H6), Propane (C3H8)

Molecular weight of CH4 = 12+4×1=16
Molecular weight of C2H6= 2×12+6×1=24+6=30

Difference of molecular weight of CH4 & C2H6 is 30-16= 14



General formula for alkene : CnH2n
E.g of alkene: ethene ( C2H2), Propene(C3H6), Butene(C4H8)

General formula for alkynes: CnH2n-2
E.g of alkynes: ethyne (C2H4), Propyne(C3H4)


[ Here n = Number of carbon atoms]

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Hope this will help you...