Find stability order of the following alkenes:
(a) Cis-but-2-ene
(b) 2,3-Dimethylbut-2-ene
(c) 2-Methylbut-2-ene
(d) Propene
(a) Cis-but-2-ene
(b) 2,3-Dimethylbut-2-ene
(c) 2-Methylbut-2-ene
(d) Propene
Show Hint
- b > a > d > c
- b > c > a > d
- a > c > b > d
- b > a > c > d
The Correct Option is B
Solution and Explanation
To determine the stability order of the given alkenes, we'll consider the degree of substitution of the double bond and the presence of steric strain. Alkenes with more substituted double bonds are generally more stable due to hyperconjugation and inductive effects. Let's analyze each alkene:
- Cis-but-2-ene: This alkene has a double bond between carbon atoms 2 and 3, with the same substituents (methyl groups) on each side, but it is arranged in the cis configuration. It is a disubstituted alkene, providing moderate stability. However, the cis configuration introduces some steric strain.
- 2,3-Dimethylbut-2-ene: This is a tetrasubstituted alkene, which means it has four alkyl groups attached to the double bond. This configuration usually offers the highest stability due to the maximum hyperconjugative and inductive effects.
- 2-Methylbut-2-ene: This is a trisubstituted alkene, as it has three alkyl groups attached to the double bond. This increases stability compared to disubstituted alkenes but is less stable than tetrasubstituted ones.
- Propene: Just a single methyl group is attached to the double bond, making it a monosubstituted alkene. It has the lowest stability among the given options.
Based on the degree of substitution and factors affecting alkene stability, the stability order is:
| Most Stable | 2,3-Dimethylbut-2-ene (>) | 2-Methylbut-2-ene (>) | Cis-but-2-ene (>) | Propene |
Thus, the correct answer is: b > c > a > d. This is because tetrasubstituted alkenes are inherently more stable than trisubstituted, then disubstituted, followed by monosubstituted alkenes.
Top JEE Main Chemistry Questions
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- At equilibrium the concentrations of and in a sealed vessel at . What will be for the reaction
- Find out the major products from the following reactions
Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$, respectively, are
- The correct order of atomic radii is:
Top JEE Main Organic Chemistry Questions
- Example of vinylic halide is
- Structure of 4-Methylpent-2-enal is
- In the given reactions identify the reagent A and reagent B
- Given below are two statement one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): CH2 = CH – CH2 – Cl is an example of allyl halide
Reason (R): Allyl halides are the compounds in which the halogen atom is attached to sp2 hybridised carbon atom.
In the light of the two above statements, choose the most appropriate answer from the options given below - Following is a confirmatory test for aromatic primary amines. Identify reagent (A) and (B)
Top JEE Main Questions
- In a hydrogen like atom, when an electron jumps from the $M$ - shell to the $L$ - shell, the wavelength of emitted radiation is $\lambda$. If an electron jumps from $N$-shell to the $L$-shell, the wavelength of emitted radiation will be :
- Two masses $m$ and $\frac{m}{2}$ are connected at the two ends of a massless rigid rod of length $l$. The rod is suspended by a thin wire of torsional constant $k$ at the centre of mass of the rod-mass system(see figure). Because of torsional constant $k$, the restoring torque is $\tau =k\theta$ for angular displacement $\theta$. If the rod is rota ted by $\theta_0$ and released, the tension in it when it passes through its mean position will be:
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- The value of is
- The number of terms of an is even. The sum of the odd terms is and of the even terms is . The last term exceeds the first by . Then the number of terms in the series is ______.