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Examoogle • User • info@examoogle.com • EE-2024-8821
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Which of the following is a ring compound with the molecular formula C ₆ H ₁₂ ?
Butane (C4H10)
Benzene (C6H6)
Cyclohexane (C6H12)
Hexane (C6H14)
Cyclohexane (C6H12)
Cyclohexane is a cycloalkane with the molecular formula C6H12, characterized by a ring of six carbon atoms, each bonded to two hydrogen atoms. Unlike benzene, which is an aromatic hydrocarbon, cyclohexane is saturated and contains only single covalent bonds.
Cyclohexane is a cycloalkane with the molecular formula C6H12, characterized by a ring of six carbon atoms, each bonded to two hydrogen atoms. Unlike benzene, which is an aromatic hydrocarbon, cyclohexane is saturated and contains only single covalent bonds.
Think of an open-chain alkane as a piece of string (hexane), and a cycloalkane as that same string with the two ends tied together to form a closed loop (cyclohexane).
Remember 'Cyclo-Closer': Cycloalkanes are simply alkanes that 'close' their chain into a ring, reducing the hydrogen count by two.
CnH2n — The general molecular formula for monocyclic cycloalkanes
C6H14 — The molecular formula for hexane (open-chain alkane)
C6H6 — The molecular formula for benzene (aromatic ring)
The general formula for a cycloalkane with one ring is CnH2n. For n=6, the formula becomes C6H12. In this structure, the carbon atoms form a ring, reducing the number of hydrogen atoms needed compared to an open-chain alkane (CnH2n+2), as two hydrogens are effectively replaced by a C-C bond to close the ring.
Cycloalkanes are saturated hydrocarbons containing one or more rings.
Cyclohexane does not exhibit aromaticity despite having a six-carbon ring.
The IUPAC general formula for cycloalkanes is CnH2n for a single ring.
Stable structure due to low ring strain in chair conformation
Widely used as a non-polar solvent in chemical laboratories
Highly flammable
Can cause dizziness or skin irritation upon prolonged exposure
Precursor for the production of nylon
Used as a solvent in lacquers and resins
Butane (C4H10) is an open-chain alkane.
Benzene (C6H6) is an aromatic ring with three double bonds.
Hexane (C6H14) is a straight-chain saturated alkane.
C is correct — Cyclohexane is a cyclic saturated hydrocarbon with the molecular formula C6H12.
Always count the carbon and hydrogen atoms carefully: if H=2×C, it is likely a cycloalkane or alkene. If H=2×C+2, it is an alkane.