What is the order of reactivity of the hydrogen halides toward addition to an alkene?
Answer and explanation
Correct answer: D.
- Step 1: The rate-determining step in electrophilic addition of hydrogen halides to alkenes is the transfer of a proton from to generate a carbocation intermediate.
- Step 2: The bond dissociation energy decreases down Group 17: () () () ().
- Step 3: Weaker acid bonds dissociate faster and deliver protons more readily, giving the reactivity sequence .
Answer
.
Why not the others: inverts the reactivity trend based on bond strength; incorrectly places hydrochloric acid above hydrobromic and hydriodic acids; mistakenly places above the more acidic .
Practise more Hydrocarbons and reaction mechanisms.
Free questions with an explanation for every one, and full timed JEE Main mock tests.
More Hydrocarbons and reaction mechanisms questions
- What is the major product obtained when propene is treated with in the presence of benzoyl peroxide?
- Which of the following carbocations is the most thermodynamically stable due to maximum hyperconjugative and resonance stabilization?
- Ozonolysis of an alkene followed by reductive workup with yields equal equimolar amounts of propanone (acetone) and ethan…
- According to Hückel's aromaticity rule, which of the following species is non-aromatic or anti-aromatic rather than aromatic?
- When propyne is passed into warm dilute in the presence of at (Kucherov reaction), what…
- In the conformational analysis of n-butane about the C2-C3 single bond, which conformation possesses the lowest potential energy (highest th…