The molecular formula of Propane is ________.

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RRB ALP Previous Paper 10 (Held On: 10 Aug 2018 Shift 1)
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  1. CH4
  2. C4H10
  3. C3H8
  4. C2H6

Answer (Detailed Solution Below)

Option 3 : C3H8
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The correct answer is option 3, i.e. C3H8.

  • The molecular formula of propane is C3H8.
  • Alkanes are acyclic hydrocarbons in which carbon-carbon atoms have a single bond between them, i.e. they are saturated hydrocarbons.
  • The general formula for alkanes is CnH2n+2, where 'n' is the number of carbon atoms.
  • Propane is the third member of the alkane family with 3 carbon atom. If we put the number of carbon and hydrogen atoms present in propane in the above-mentioned formula, we will find that it holds true.
  • CH4 is Methane, the first member of the alkane family.
  • C4H10 is Butane, the fourth in the line of alkanes.
  • C2H6 is Ethane, the second member of the alkane family.
  • The lower alkanes from C1 to C4 are gases, from C5 to C16 are liquids and beyond that are solids.

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