Question

Which one of the following is NOT typical of a homologous series ? Option 5 Their physical properties show gradual change as size of compounds increase They have similar methods of preparation . Its members have a general formula . Each successive members differs by CH

Answer 1

Answer:

PLEASE MARK AS BRAINLIEST

Answer 2

The statement 'Each successive member differs by CH' is NOT typical of a homologous series.

• A homologous series is a sequence of compounds with the same functional group and similar chemical properties.

STATEMENT 1: Their physical properties show gradual change as size of compounds increase.

• This statement is true as members of a homologous series show change in mass, state, melting point, etc as size of the compound increases.

STATEMENT 2 :  They have similar methods of preparation.

• This statement is true. Members of a homologous series have similar methods of preparation due to their similar chemical properties, which arise from a common functional group.

STATEMENT 3 : Its members have a general formula.

• This statement is true as for example in the case of alkanes, all members have the same general formula-  $C_{n}$$H_{2n + 2}$.
• Similarly all homologous series have a common general formula.

STATEMENT 4 :  Each successive members differs by CH.

• This statement is false. Each successive member differs by C$H_{2}$ or by a mass of 14 g.
• For example members of alkane series are $CH_{4}$, $C_{2} H_{6}$ etc.

Hence, statement 4 :  Each successive members differs by CH is NOT typical of a homologous series.