Question:

According to Cahn-Ingold-Prelog sequence rules, the correct order of priority for the given groups is

Updated On: Dec 16, 2025
  • $- COOH > - CH_2OH > - OH > - CHO $
  • $- COOH > - CHO > -CH_2OH > - OH$
  • $-OH> - CH_2OH > - CHO > -COOH$
  • $-OH > - COOH > - CHO > - CH_2OH$
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The Correct Option is D

Solution and Explanation

According to Cahn-Ingold-Prelog sequence rules, the priority of groups is decided by the atomic number of their atoms. When the atom -(which is directly attached to the asymmetric carbon atom) of a group has higher atomic number, then the group gets higher priority. Groups with atoms of comparable atomic number having double or triple bond, have high priority than those have single bond
Hence, the order of priority of groups is
$? OH> ? COOH > ? CHO > ? CH_2OH$
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Classification of Organic Compounds

Organic Compounds can be classified into:

Classification based on the structure:

The classification of organic compounds is based on structure such as:

  1. Acyclic or open chain compounds - Acyclic compounds are just opposite to cyclic compounds because their molecules don’t form any ring. It is called open-chain compounds because they have a linear structure.
  2. Cyclic or closed chain compounds - Cyclic compounds are also known as “Ring compounds.”