Question:
Which of the following alkenes is most easily formed by dehydrohalogenation of alkyl halides?
Which of the following alkenes is most easily formed by dehydrohalogenation of alkyl halides?
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Zaitsev rule: more substituted alkene = more stable = major product.
Updated On: Apr 26, 2026
- \(\text{R}_2\text{C = CH}_2\)
- \(\text{RCH = CHR}\)
- \(\text{R}_2\text{C = CHR}\)
- \(\text{R}_2\text{C = CR}_2\)
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The Correct Option is D
Solution and Explanation
Concept:
According to Zaitsev's rule, during elimination reactions, the more substituted alkene is formed as the major product because it is more stable. Step 1: Understand stability of alkenes. Alkene stability increases with substitution: \[ \text{Tetra-substituted}>\text{Tri-substituted}>\text{Di-substituted}>\text{Mono-substituted} \]
Step 2: Analyze options.
Step 3: Conclusion. \[ \text{Most substituted alkene forms most easily} \]
According to Zaitsev's rule, during elimination reactions, the more substituted alkene is formed as the major product because it is more stable. Step 1: Understand stability of alkenes. Alkene stability increases with substitution: \[ \text{Tetra-substituted}>\text{Tri-substituted}>\text{Di-substituted}>\text{Mono-substituted} \]
Step 2: Analyze options.
- (A) \(\text{R}_2\text{C = CH}_2\) â least substituted
- (B) \(\text{RCH = CHR}\) â di-substituted
- (C) \(\text{R}_2\text{C = CHR}\) â tri-substituted
- (D) \(\text{R}_2\text{C = CR}_2\) â tetra-substituted (most stable) \checkmark
Step 3: Conclusion. \[ \text{Most substituted alkene forms most easily} \]
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