In polyfunctional compounds, carbon-containing terminal groups like , , and are known as "DON" groups. What strict numbering rule applies to them when they are the PFG?

Question

In polyfunctional compounds, carbon-containing terminal groups like $-COOH$, $-CHO$, and $-CN$ are known as "DON" groups. What strict numbering rule applies to them when they are the PFG?

Prashant Kotian · Accepted Answer

Correct answer: B. If a chain-terminating carbon-containing group is the PFG, its carbon atom MUST be assigned position number 1 in the principal carbon chain (unless special 1993 rules apply for >= 3 groups).

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