Question

Fill in the gaps in the table a, b and c of homologous series.

a. Homologous Series of Alkanes

Name	Molecular formula	Condensed Structural formula	Number of carbon atoms	Number of -CH2 - units	Boiling point °C
Methane	CH4	CH4	1	1	−162
Ethane	C2H6	\[\ce{CH3 - CH3}\]	2	2	−88.5
Propane	C3H8	\[\ce{CH3 - CH2 - CH3}\]	3	3	−42
Butane	C4H10	\[\ce{CH3 - CH2 - CH2 - CH3}\]	...	...	0
Pentane	C5H12	\[\ce{CH3 - CH2 - CH2 - CH2 - CH3}\]	...	...	36
Hexane	C6H14	\[\ce{CH3 - CH2 - CH2 - CH2 - CH2 - CH3}\]	...	...	69

b. Homologous Series of Alcohols

Name	Molecular formula	Condensed Structural formula	Number of carbon atoms	Number of -CH2 - units	Boiling point °C
Methanol	CH4O	\[\ce{CH3 - OH}\]	1	1	63
Ethanol	C2H6O	\[\ce{CH3 - CH2 - OH}\]	2	2	78
Propanol	C3H8O	\[\ce{CH3 - CH2 - CH2 - OH}\]	...	...	97
Butanol	C4H10O	\[\ce{CH3 - CH2 - CH2 - CH2 - OH}\]	...	...	118

c. Homologous Series of Alkenes

Name	Molecular formula	Condensed Structural formula	Number of carbon atoms	Number of -CH2 - units	Boiling point °C
Ethene	C2H4	\[\ce{CH2 = CH2}\]	2	0	−102
Propene	C3H6	\[\ce{CH3 - CH = CH2}\]	3	1	−48
1-Butene	C4H8	\[\ce{CH3 - CH2 - CH = CH2}\]	...	...	−6.5
1-Pentene	C5H10	\[\ce{CH3 - CH2 - CH2 - CH = CH2}\]	...	...	30

Answer 1

a. Homologous Series of Alkanes

Name	Molecular formula	Condensed Structural formula	Number of carbon atoms	Number of -CH2 - units	Boiling point °C
Methane	CH4	CH4	1	1	−162
Ethane	C2H6	\[\ce{CH3 - CH3}\]	2	2	−88.5
Propane	C3H8	\[\ce{CH3 - CH2 - CH3}\]	3	3	−42
Butane	C4H10	\[\ce{CH3 - CH2 - CH2 - CH3}\]	4	4	0
Pentane	C5H12	\[\ce{CH3 - CH2 - CH2 - CH2 - CH3}\]	5	5	36
Hexane	C6H14	\[\ce{CH3 - CH2 - CH2 - CH2 - CH2 - CH3}\]	6	6	69

b. Homologous Series of Alcohols

Name	Molecular formula	Condensed Structural formula	Number of carbon atoms	Number of -CH2 - units	Boiling point °C
Methanol	CH4O	\[\ce{CH3 - OH}\]	1	1	63
Ethanol	C2H6O	\[\ce{CH3 - CH2 - OH}\]	2	2	78
Propanol	C3H8O	\[\ce{CH3 - CH2 - CH2 - OH}\]	3	3	97
Butanol	C4H10O	\[\ce{CH3 - CH2 - CH2 - CH2 - OH}\]	4	4	118

c. Homologous Series of Alkenes

Name	Molecular formula	Condensed Structural formula	Number of carbon atoms	Number of -CH2 - units	Boiling point °C
Ethene	C2H4	\[\ce{CH2 = CH2}\]	2	0	−102
Propene	C3H6	\[\ce{CH3 - CH = CH2}\]	3	1	−48
1-Butene	C4H8	\[\ce{CH3 - CH2 - CH = CH2}\]	4	2	−6.5
1-Pentene	C5H10	\[\ce{CH3 - CH2 - CH2 - CH = CH2}\]	5	3	30