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Answer: 1. Saytzeff's Rule

Key idea: in dehydrohalogenation, the more substituted (more stable) alkene is the major product. This is Saytzeff's (Zaitsev) rule.

2-Bromopentane can give pent-1-ene (less substituted) or pent-2-ene (disubstituted, more stable). Pent-2-ene is major, following Saytzeff's rule.

Hund's rule concerns electron filling, Hofmann rule favours the least substituted alkene (bulky base or ammonium salts), and Huckel's rule is for aromaticity.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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