Question

CH4,C2H6,C3H8,C4H10.......are called homologous series.why?​

Answer 1

Homologous series

Explanation:

• The compounds which have the same general formula, they are called compounds belonging to the same homologous series.
• The given compounds such as $CH_4,C_2H_6,C_3H_8, and C_4H_{10}$ are called homologous series because they possess same general formula as shown:

1. $C_nH_{2n+2} : C_1H_{2(1)+2} = CH_4$
2. $C_nH_{2n+2} : C_2H_{2(2)+2} = C_2H_{4+2} = C_2H_6$
3. $C_nH_{2n+2}:C_3H_{2(3)+2} = C_3H_{6+2} = C_3H_8$
4. $C_nH_{2n+2} = C_4H_{2(4)+2} = C_4H_{8+2} = C_4H_{10}$

• As per the general formula, the given series is inferred as homologous series of alkanes and their names are:

1. $CH_4$ - Methane
2. $C_2H_6$ - Ethane
3. $C_3H_8$ - Butane
4. $C_4H_{10}$ - Propane

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