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Hydrocarbons
Reactions of Alkenes – Ozonolysis and Markovnikov Addition of HCl
1 question from 1 paper, each with its answer.
- question
- 1
- paper
- 1
- years asked, 2017–2026
- 1 of 10
- of Hydrocarbons
- 1.33%
Concepts tested
- identifying an alkene from ozonolysis products
All Questions
2019 1 question
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An alkene 'A' on reaction with $O_3$ and Zn-$H_2O$ gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene 'A' gives 'B' as the major product. The structure of product 'B' is:Ozonolysis of A gives propanone and ethanal in equimolar ratio, so A is $(CH_3)_2C=CH-CH_3$ (2-methylbut-2-ene). Addition of HCl follows Markovnikov's rule: $H^+$ adds to the CH carbon to give the more stable 3° carbocation, and $Cl^-$ attaches to it. B: $H_3C-CH_2-C(CH_3)(Cl)-CH_3$ (2-chloro-2-methylbutane)