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Question
Which of the following reactions gives a racemic mixture?
Which of the following reactions gives a racemic mixture?
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Solution
The correct option is D
Halogens like Br, Cl and I add up to alkenes to form vicinal dihalides. Addition of halogens to alkenes is an example of electrophilic addition reaction. Addition of two substituents to multiple bonded C atoms from the opposite sides of the multiple bond is known as anti-addition. When anti-addition takes place to a symmetrical trans alkene, then meso compound is formed.
When anti addition takes place to a symmetrical cis alkene or unsymmetrical alkene (both cis and trans), then racemic mixture is formed.
Hence, (a) gives a meso compound.
(c) and (d) gives racemic mixture.
Hydrogenation reaction does not give any racemic or meso compounds.
Halogens like Br, Cl and I add up to alkenes to form vicinal dihalides. Addition of halogens to alkenes is an example of electrophilic addition reaction. Addition of two substituents to multiple bonded C atoms from the opposite sides of the multiple bond is known as anti-addition. When anti-addition takes place to a symmetrical trans alkene, then meso compound is formed.
When anti addition takes place to a symmetrical cis alkene or unsymmetrical alkene (both cis and trans), then racemic mixture is formed.
Hence, (a) gives a meso compound.
(c) and (d) gives racemic mixture.
Hydrogenation reaction does not give any racemic or meso compounds.
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