Question
Wed January 30, 2013 By:
 

Sir, What is a parent chain atom and how can we identify them in a structure?

Expert Reply
Thu January 31, 2013

The chain which contains the highest number of C-atoms.

Identification of the parent hydrocarbon chain . This chain must obey the following rules, in order of precedence:

  1. It should have the maximum number of substituents of the suffix functional group. By suffix, it is meant that the parent functional group should have a suffix, unlike halogen substituents. If more than one functional group is present, the one with highest precedence should be used.
  2. It should have the maximum number of multiple bonds
  3. It should have the maximum number of double bonds.
  4. It should have the maximum length.
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