According to the CIP multiple bond expansion rules, how is an aldehyde group () correctly prioritized against a primary alcohol group ()?

Question

According to the CIP multiple bond expansion rules, how is an aldehyde group ($-CHO$) correctly prioritized against a primary alcohol group ($-CH_2OH$)?

Prashant Kotian · Accepted Answer

Correct answer: B. CIP rules mandate that multiple bonds are mathematically expanded. An aldehyde's double bond means the carbon is treated as if it is bonded to (O, O, H). The primary alcohol's carbon is only bonded to (O, H, H). Because the second comparison point pits Oxygen against Hydrogen, definitively receives higher priority.

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