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According to the Saytzeff (Zaitsev) rule, in a dehydrohalogenation the alkene formed in the larger amount is the one that

  1. Ais formed by removal of hydrogen from the beta carbon having the most hydrogens
  2. Bhas its double bond at the end of the carbon chain
  3. Chas the greater number of hydrogen atoms on the doubly bonded carbon atoms
  4. Dhas the greater number of alkyl groups on the doubly bonded carbon atoms

Answer: D

The Saytzeff rule states that the more highly substituted (more stable) alkene is the major product, because hyperconjugation and alkyl substitution stabilise the double bond. Hence the alkene with more alkyl groups on the sp2 carbons predominates, and hydrogen is lost from the beta carbon with the fewest hydrogens.
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