The general formula of alkane is-

This question was previously asked in
RRC Group D Previous Paper 56 (Held On: 16 Oct 2018 Shift 1)
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  1. CnH2n–2
  2. CnH2n+2
  3. CnH3n–3
  4. CnH2n

Answer (Detailed Solution Below)

Option 2 : CnH2n+2
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RRB Group D Full Test 1
100 Qs. 100 Marks 90 Mins

Detailed Solution

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The correct answer is CnH2n+2.

  • The general formula of an alkane is CnH2n+2.

Key Points

  • Hydrocarbons
    • Compounds made of carbon and hydrogen atoms only are called hydrocarbons.
    • Saturated hydrocarbons:
      • The hydrocarbons in which carbon atoms are singly bonded are called saturated hydrocarbons.
      • Saturated hydrocarbons are also called alkanes or paraffin.
        • The general formula of alkane– CnH2n+2.
    • Unsaturated hydrocarbons:
      • The hydrocarbons in which carbon atoms are either doubly or triply bonded are called unsaturated hydrocarbons.
      • Doubly bonded (carbon atoms) hydrocarbons are called alkenes.
      • The general formula of alkene is CnH2n.
    • Triply-bonded carbon:
      • Hydrocarbons containing at least one carbon-carbon triple bond between two carbon atoms are called alkynes.
      • The general formula of alkynes is CnH2n-2.

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