Which of the following reactions is most exot | vedclass

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(C) The enthalpy change of a free radical halogenation reaction depends on the bond dissociation energies of the reactants and products. $(i)$ Chlorin

Vedclass · Accepted Answer

Isobutane + $Cl_2 \xrightarrow{hv}$ $2-$chloro$-2-$methylpropane + $HCl$

Vedclass · Answer

(C) The enthalpy change of a free radical halogenation reaction depends on the bond dissociation energies of the reactants and products. $(i)$ Chlorination is generally more exothermic than bromination because the $C-Cl$ bond formed is stronger than the $C-Br$ bond,and the $H-Cl$ bond formed is stronger than the $H-Br$ bond. $(ii)$ Among the given options,the chlorination of alkanes is more exothermic than bromination. $(iii)$ Comparing the chlorination of propane and isobutane,the reaction with isobutane is more exothermic because it leads to the formation of a more stable $3^{\circ}$ alkyl chloride compared to the $2^{\circ}$ alkyl chloride formed from propane,due to the higher stability of the $3^{\circ}$ free radical intermediate. Therefore,the reaction of isobutane with $Cl_2$ is the most exothermic.

Which of the following reactions is most exothermic?

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