When an aldehyde group () acts as a subordinate substituent, under what specific structural condition is the prefix "formyl" used instead of "oxo"?

Question

When an aldehyde group ($-CHO$) acts as a subordinate substituent, under what specific structural condition is the prefix "formyl" used instead of "oxo"?

Prashant Kotian · Accepted Answer

Correct answer: B. "Formyl" refers to the entire group acting as a branch off the parent chain. "Oxo" is used when the carbon atom of the group is already counted as part of the principal carbon chain skeleton.

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