Nomenclature of Organic Compounds — Prelims Strategy

Prelims Strategy

For NEET prelims, a systematic approach to nomenclature questions is key. First, always identify the principal functional group (if any) and the longest continuous carbon chain that includes it, along with any multiple bonds.

Remember the priority order of functional groups: carboxylic acids > esters > amides > nitriles > aldehydes > ketones > alcohols > amines > alkenes > alkynes > alkanes. The highest priority group determines the suffix.

Next, number the parent chain to give the principal functional group the lowest possible locant. If there's a tie, prioritize multiple bonds, then substituents. For substituents, list them alphabetically, ignoring prefixes like 'di-', 'tri-'.

Pay close attention to locants and their placement. For cyclic compounds, the ring is usually the parent, and numbering starts from the carbon bearing the principal functional group or a substituent to achieve the lowest sum of locants.

Practice drawing structures from names and vice-versa. Be aware of common names for simple compounds (e.g., acetone, acetic acid, phenol, toluene) as they often appear in questions. Trap options usually involve incorrect numbering, wrong parent chain selection, or misapplication of functional group priority.

Always re-check your chosen name against the structure to ensure it's unambiguous.