Which of the following reaction is used to locate the position of double bond in the compound?
Correct answer: B. Ozonolysis
- A. Dehydration
- B. Ozonolysis
- C. Markovnikov's addition
- D. Oxidation with KMnO4
Explanation
OPTION A: Dehydration reactions can be defined as chemical reactions in which a water molecule is eliminated from the reactant molecule. OPTION B: Ozone (O3) is a highly reactive allotropic form of oxygen. It reacts vigorously with alkenes to form unstable molozonide. It rearranges spontaneously to form an ozonide. Ozonides are unstable compounds and are reduced directly by treatment with zinc and H2O. The reduction produces carbonyl compounds (aldehydes or ketones). Ozonolysis is used to locate the position of a double bond in an alkene. Hence, B is the correct option. OPTION C: Markonikov's rules state that when an asymmetric reagent is added to an asymmetric alkene, the positive part of the molecule attaches itself to that carbon atom involved in the double bond, holding a greater number of hydrogen atoms.OPTION D: It is an incorrect option.
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About Alkenes
Alkenes are unsaturated hydrocarbons containing a carbon-carbon double bond with sigma and pi components and restricted rotation. Their reactions include electrophilic addition of hydrogen, halogens, hydrogen halides and water, with Markovnikov orientation, oxidation, combustion and polymerisation, while their preparation commonly involves elimination from alkyl halides or alcohols.
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