Question

In assigning R - S configuration, which among the following groups has highest priority?

Options

• \[\ce{- SO3H}\]

• \[\ce{- COOH}\]

• \[\ce{- CHO}\]

• \[\ce{- C6H5}\]

Answer 1

\[\ce{- SO3H}\]

Explanation:

The atoms that are immediately connected to the chiral carbon and are organised in decreasing atomic number determine the priority sequence in the R-S configuration. From the given groups, sulphur (S) has the highest atomic number i.e., 16 therefore it has highest priority.