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Question

The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the energy required for homolytic cleavage of a bond is called Bond Dissociation Energy (BDE) or Bond Strength. BDE is affected by s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below:

For the following reaction
CH4(g)+Cl2(g)lightCH3Cl(g)+HCl(g)

The correct statement is

A
Initiation step is exothermic with ΔH=58 kcal mol1.
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B
Propagation step involving CH3 formation is exothermic with ΔH=2 kcal mol1.
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C
Propagation step involving CH3Cl formation is endothermic with ΔH=+27 kcal mol1.
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D
The reaction is exothermic with ΔH=25kcal mol1.
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Solution

The correct option is D The reaction is exothermic with ΔH=25kcal mol1.
CH4+Cl2lightCH3Cl+HCl this reaction is obtained from given reaction

CH3HCH3+H ...(1)
ClClCl+Cl ...(2)
CH3ClCH3+Cl ...(3)
HClH+Cl ...(4)
Hence ΔH=105+5885103=25KCal/mole

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