Which of the following is not the property of homologous series?

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They can be represented by a general formula.

They differ by $- C H_{2}$ unit.

They all contain double bond

They differ by $14$ units by mass

answer is C.

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Detailed Solution

They all contain double bonds that are not the property of homologous series.
A homologous series is defined as a series of compounds that are similarly constituted and the members present have the same functional group and similar chemical properties.
Any two succeeding members of a specific series can be distinguished by a -CH₂ unit in terms of their molecular formula.
The two adjacent homologues differ by 1 carbon atom and 2 hydrogen atoms in their molecular formulas.
The difference in the molecular masses of any two adjacent homologues or members is 14u.
A gradual change in the physical properties is seen because of the increase in the molecular masses.
For example, melting and boiling points increase with the increasing molecular mass.

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