Question:medium

IUPAC name of the some alkenes are given below. Find out the correct stability order.
A. 2-Methylbut-2-ene
B. cis-But-2-ene
C. 2,3-Dimethylbut-2-ene
D. Prop-1-ene
Choose the correct answer from the options given below :

Updated On: Jun 28, 2026
  • C >A >B >D
  • C >A >D >B
  • B >D >A >C
  • A > B > C > D
Show Solution

The Correct Option is A

Solution and Explanation

Step 1: Understanding the Concept:
The stability of alkenes is primarily determined by the degree of substitution at the double bond. According to Saytzeff's rule and hyperconjugation, more substituted alkenes are generally more stable.
Step 2: Detailed Explanation:
Stability increases with the number of $\alpha$-hydrogens (hyperconjugative structures).
C. 2,3-Dimethylbut-2-ene: $(CH_3)_2C=C(CH_3)_2$. It is tetra-substituted and has 12 $\alpha$-H. (Most stable).
A. 2-Methylbut-2-ene: $(CH_3)_2C=CHCH_3$. It is tri-substituted and has 9 $\alpha$-H.
B. cis-But-2-ene: $CH_3CH=CHCH_3$. It is di-substituted and has 6 $\alpha$-H.
D. Prop-1-ene: $CH_3CH=CH_2$. It is mono-substituted and has 3 $\alpha$-H. (Least stable).
Order: C > A > B > D.
Step 3: Final Answer:
The stability order is C > A > B > D.
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