Hydrocarbons 2 Question 3
3. The major product of the following addition reaction is
$$ \mathrm{H}{3} \mathrm{C}-\mathrm{CH}=\mathrm{CH}{2} \xrightarrow{\mathrm{Cl}{2} / \mathrm{H}{2} \mathrm{O}} $$
(a) $\mathrm{CH}{3}-\underset{\mathrm{Cl}}{\mathrm{CH}}-\underset{\mathrm{OH}}{\mathrm{CH}{2}}$
(2019 Main, 12 April I)
(b)
(c)
(d)
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Answer:
Correct Answer: 3. (d)
Solution:
- The major product of the given addition reaction is
In this reaction, $\mathrm{H}_{2} \mathrm{O}$ is used as a solvent and the major product of the reaction will be a vicinal halohydrin. A halohydrin is an organic molecule that contains both $\mathrm{OH}$ group and a halogen. In a vicinal halohydrin, the $\mathrm{OH}$ and halogen are bonded to adjacent carbons.
$\mathrm{H}{3} \mathrm{C}-\mathrm{CH}=\mathrm{CH}{2} \xrightarrow{\mathrm{Cl}{2} / \mathrm{H}{2} \mathrm{O}} \mathrm{H}{3} \mathrm{C}-\underset{\mathrm{OH}}{\mathrm{CH}}-\underset{\mathrm{Cl}}{\mathrm{CH}{2}}+$
A chlorohydrin (major product)
(Minor product)
The reaction proceeds through following mechanism :
