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Which of the following options are correct? 1. Three carbon atom is indicated by 'prop'. 2. Four carbon atom is indicated by 'but'. 3. Seven carbon atom is indicated by 'Hex'. 4. Nine carbon atom is indicated by 'Non'.

Which of the following options are correct? 1. Three carbon atom is indicated by 'prop'. 2. Four carbon atom is indicated by 'but'. 3. Seven carbon atom is indicated by 'Hex'. 4. Nine carbon atom is indicated by 'Non'. Correct Answer Only 1, 2 & 4 are correct

The correct answer is 3 i.e. Only 1, 2 & 4 are correct.

Explanation:

  • The organic compounds have two names: common name and official names (IUPAC names).
  • The official names or systematic names of organic compounds were given by the International Union of Pure and Applied Chemistry in 1958, so they are called IUPAC names or IUPAC nomenclature.
  • To name hydrocarbons by the IUPAC method, we should remember the following points :

The number of carbon atoms in a hydrocarbon is indicated by using the following stems:

One carbon atom Meth
Two carbon atom Eth
Three carbon atom Prop
Four carbon atom But
Five carbon atom Pent
Six carbon atom Hex
Seven carbon atom Hept
Eight carbon atom Oct
Nine carbon atom Non
Ten carbon atom Dec
  • A saturated hydrocarbon containing a single bond is indicated by writing the word 'ane' after the stem.
  • An unsaturated hydrocarbon containing a double bond is indicated by writing the word 'ene' after the stem.
  • An unsaturated hydrocarbon containing a triple bond is indicated by writing the word 'yne' after the stem.

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