Question

# Which of the following cleavage of bond can result in Homolytic Cleavage?

A

B

C

D

Solution

## The correct option is B   What do you mean by Homolytic Cleavage? Homolytic Fission: Occurs in gas phase or in non-polar solvents and is catalysed by reagents. In such fission free radicals are formed. Here the bond pair is equally shared after the fission. AB → A0 + B0                                     (free radicals) Condition for Homolytic Bond Fission : Homolysis takes place in the presence of peroxide, UV light, heat (≥ 500∘C), electricity and free radical. The process is known as initiation of free radical reaction. A:B  (i)Peroxide−−−−−−−−−→  A0+B0            (ii) hv            (iii) Δ             (iv) Electricity or             (v) Free radical CH3 − H  hv−→  .CH3↓ + .H                             methyl free radical So, one of the necessary condition is: It should be non - polar. ⇒ If there will electronegative difference, the compound will be polar. In Cl − Cl and CH3−H, they both are non polar, hence Homolytic fission.  Chemistry

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