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KCET2017ChemistryGeneral Organic Chemistry

In which of the following, homolytic bond fission takes place ?

Options

  1. AAlkaline hydrolysis of ethyl chloride
  2. BAddition of ( HBr ) to double bond
  3. CFree radical chlorination of methane
  4. DNitration of Benzene

Correct answer

C. Free radical chlorination of methane

Step-by-step solution

Homolytic bond fission takes place in free radical chlorination of methane. [ CH ₃- H + Cl ₂ 520-670 ~K or hv > CH ₃- Cl + HCl ] The reaction occurs by a free radical mechanism which involves the following ( 3 ) steps: Chain initiation Chain propagation [ array l CH ₄+ Methane Cl + Chlorine free radical Cl ~ ~ H ₃+ H Cl CH ₃+ Cl - Cl hv CH ₃- Cl + Cl CH ₃ Cl + Cl CH ₂ Cl + HCl CH ₂ Cl + Cl - Cl CH ₂ Cl ₂+ Cl array ] Chain termination [ array l Cl + Cl Cl - Cl CH ₃+ CH ₃ CH ₃- CH ₃ (Ethane) CH ₃+ Cl CH ₃- Cl array ]

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