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Option 2 : Butane
All the hydrocarbons given in the series belong to alkane group.
1) First member of alkane group is Methane (Contains 1 carbon)
2) Second member of alkane group is Ethane (Contain 2 carbons)
3) Third member of alkane group is Propane (Contain 3 carbons)
4) Forth member of alkane group is Butane (Contain 4 carbons)
5) Fifth member of alkane group is Pentane (Contain 5 carbons)
6) Sixth member of alkane group is Hexane (Contain 6 carbons)
Hence, ‘Butane’ is the correct answer.
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