In which of the following groups do all me hydrocarbons NOT belong to the same homologous series?

Correct option is C

Sol: The correct answer is (c) $$CH_4,C_2 H_6,C_3 H_6$$

Key Points:

(1) $$C _3​ H _6​ ,C _5​ H _{10}​ ,C _7​ H _{14}​$$ -

General formula: $$C_nH_{2n}$$

This is the homologous series of alkenes.

All belong to the same series

(2) $$C _2​ H _2​ ,C _3​ H _4​ ,C _4​ H _6​$$

General formula: $$C_nH_{2n-2}$$

This is the homologous series of alkynes.

All belong to the same series

(3) $$CH _4​ ,C _2​ H _6​ ,C _3​ H _6​$$

​​$$CH_4$$ : General formula $$C_nH_{2n+2}$$ (alkane)

​$$C _2​ H _6$$: General formula $$C _n​ H _{2n+2}$$ (alkane)

​$$C _3​ H _6$$: General formula $$C_nH_{2n}$$ (alkene)

​Do not belong to the same series

(4) $$C _2​ H _4​ ,C _3​ H _6​ ,C _4​ H _8​$$ 

​General formula: $$C_nH_{2n}$$

This is the homologous series of alkenes.

All belong to the same series

Reason- $$CH_4$$ and $$C _2​ H _6$$ are alkanes, whereas $$C_3H_6$$ is an alkene​

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CnH2nC_nH_{2nThis is the homologous series of alkenes.