O/N 2019/P11/Q32
Which statements are true for homologous series?
1 Each series contains saturated compounds.
2 The compounds in each series are unreactive.
3 Each series has a general formula.
4 Each series has a gradation in physical properties.
A 1, 2, 3 and 4
B 1, 2, and 3 only
C 1 and 4 only
D 3 and 4 only
Answer: D
Explaination
Homologous series is the family of organic compound with similar chemical properties and same functional group, same general formula differing from the successive member by CH2.
Hence, not all homologous series are saturated as others are unsaturated hydrocarbons. Alkanes have only one C-C single bond and C-H single bond as this sigma bond is stronger and difficult to break. On the other hand like alkene have double bond one is sigma bond and second is pie bond which is weak bond so they are more reactive than alkanes.
