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While numbering carbon atoms of long carbon chain numbering should be done in such a manner that substitution gets

1. lowest possible number
2. highest possible number
3. some middle number
4. none of the above

Correct answer: lowest possible number

Solution

In IUPAC nomenclature, carbon chains are numbered to give substituents the lowest possible numbers. This makes the name unambiguous and follows the lowest-locant rule.

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