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Zaitsev's (Saytzeff's) rule states that in a dehydrohalogenation reaction:
ABoth alkenes form in equal amounts
BThe more substituted alkene (the one with the greater number of alkyl groups attached to the doubly bonded carbons) is the preferred (major) product
COnly cis-alkenes are formed
DThe least substituted alkene is preferred
Answer & Solution
Correct answer: B. The more substituted alkene (the one with the greater number of alkyl groups attached to the doubly bonded carbons) is the preferred (major) product
**Zaitsev (Saytzeff) rule**: in β-elimination, the **more substituted (more stable) alkene** is the major product because it is thermodynamically more stable (hyperconjugation). The β-hydrogen on the more substituted β-carbon is preferentially removed.
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