Which of the following is a free radical substitution reaction ?

1. 
2. 
3. 
4. ${\mathrm{CH}}_3-\mathrm{CHO}+\mathrm{HCN}⟶{\mathrm{CH}}_3-\mathrm{CH}\left(\mathrm{OH}\right)\mathrm{CN}$

Solution

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Asked in: JEE-TOPICTESTS-CHEMISTRY

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