Identify among the following which is not the unsaturated hydrocarbon.
Correct answer: B. C5H12
- A. C4H6
- B. C5H12
- C. C3H4
- D. C6H10
Explanation
C5H12 fits the alkane formula CnH2n+2 because 2(5) + 2 = 12, so it is saturated rather than unsaturated. C4H6, C3H4 and C6H10 have fewer hydrogens than their corresponding alkane formulas and can contain multiple bonds; students may wrongly classify every hydrocarbon with a subscripted carbon number as unsaturated.
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About Alkanes
Alkanes are saturated hydrocarbons containing only carbon-carbon and carbon-hydrogen single bonds, with the general formula CnH2n+2 for open chains. Their structure, isomerism, IUPAC nomenclature, physical properties, combustion, free-radical halogenation and conformations are covered, including the difference between substitution in alkanes and addition in unsaturated hydrocarbons.
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