Which of the following has neither secondary nor tertiary hydrogen?
Correct answer: C. Neo- pentane
- A. Isobutane
- B. Pentane
- C. Neo- pentane
- D. Isopentane
Explanation
Option C: Neo-pentane (CH3-C(CH3)3) does not have secondary or tertiary hydrogens. The central carbon atom is bonded to four other carbon atoms, making it a quaternary carbon. Option A: Isobutane (CH3-CH(CH3)-CH3) has secondary hydrogens because the central carbon atom is bonded to two other carbon atoms. Option B: Pentane (CH3-CH2-CH2-CH2-CH3) has secondary hydrogens because the middle carbon atom is bonded to two other carbon atoms. Option C: Neo-pentane (CH3-C(CH3)3) does not have secondary or tertiary hydrogens. The central carbon atom is bonded to four other carbon atoms, making it a quaternary carbon. Option D: Isopentane (CH3-CH2-CH(CH3)-CH3) has secondary hydrogens because the second carbon atom from the left is bonded to two other carbon atoms.
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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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