Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main20265 April 2026Evening ShiftChemistryHydrocarbonsActual

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 :

Options

  1. AC > A > B > D
  2. BC > A > D > B
  3. CB > D > A > C
  4. DA > B > C > D

Correct answer

A. C > A > B > D

Step-by-step solution

The stability of alkenes is directly proportional to the number of -hydrogen atoms due to hyperconjugation. Let us count the number of -hydrogen atoms in each given alkene: A. 2-Methylbut-2-ene: (CH₃)₂C=CHCH₃ Number of -hydrogen atoms = 3 + 3 + 3 = 9 B. cis-But-2-ene: CH₃CH=CHCH₃ Number of -hydrogen atoms = 3 + 3 = 6 C. 2,3-Dimethylbut-2-ene: (CH₃)₂C=C(CH₃)₂ Number of -hydrogen atoms = 3 + 3 + 3 + 3 = 12 D. Prop-1-ene: CH₃CH=CH₂ Number of -hydrogen atoms = 3 Since the stability of an alkene increases with the numbe

Practice Hydrocarbons on Quantrex Academy →

More from Hydrocarbons

In the following reaction sequence, Q , R , S and T are the major products. The correct statement(s) about Q , R , S and T is(are) 2026Treatment of buta-1,3-diyne with NaNH ₂ ( 2 equivalents), followed by reaction with excess of trans - CH ₃ -CH=CH-CH ₂ -Br gives X as the major product. The maximum number of carbo 2026The List-II contains products obtained from the reaction of compounds in List-I with O ₃ /Zn- H ₂ O followed by cyclization (via more stable enolate) in the presence of aqueous NaO 2026Natural rubber on complete ozonolysis ( O ₃ /Zn- H ₂ O ) gives compound X as the major product. X gives positive iodoform and Tollen's tests. X on heating with aqueous NaOH gives Y 2026An optically active alkyl bromide C₄ H₉ Br, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to give compound [B]. Compound [B] reacts with ethanolic 2026An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination with Cl₂ /h , (Y) gives only one monochlorinated product (Z) . The total number of primary carb 2026R_f value for 2 -methylpropene in a solvent system (Ethyl acetate + ether) is 0.42 . 2 -methylpropene is treated with dilute H ₂ SO ₄ to give major organic product (X). R_f value f 2026Given below are two statements: Statement I: Methane can be prepared by decarboxylation of sodium ethanoate, Kolbe's electrolysis of sodium acetate and reaction of CH ₃ MgBr with w 2026 Full Hydrocarbons list All JEE Main PYQs