Question

Consider the following statements about homologous series of carbon compounds:
(a) All succeeding members differ by –CH₂ unit.
(b) Melting point and boiling point increases with increasing molecular mass.
(c) The difference in molecular masses between two successive members is 16 u.
(d) C₂H₂ and C₃H₄ are NOT the successive members of alkyne series.
The correct statements are –

• (a) and (b)
• (b) and (c)
• (a) and (c)
• (c) and (d)

Answer 1

The Correct Option is A

• (a) is correct because members of a homologous series differ by a \(CH_2\) unit.
• (b) is correct as the melting and boiling points increase with increasing molecular mass due to stronger van der Waals forces.
• (c) is incorrect because the difference in molecular mass between two successive members is 14 u, not 16 u.
• (d) is incorrect as \(C_2H_2\) and \(C_2H_4\) belong to different series (alkyne and alkene, respectively).