Basics Of Organic Chemistry

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 :



Cl \(-\) Cl (g) \(\to\) Cl\(_{(g)}^ \bullet\) + Cl\(_{(g)}^ \bullet\) \(\Delta\)H\(^\circ\) = 58 kcal mol^\(-\)1

H₃C \(-\) Cl (g) \(\to\) H₃C\(_{(g)}^ \bullet\) + Cl\(_{(g)}^ \bullet\) \(\Delta\)H\(^\circ\) = 85 kcal mol^\(-\)1

H \(-\) Cl (g) \(\to\) H\(_{(g)}^ \bullet\) + Cl\(_{(g)}^ \bullet\) \(\Delta\)H\(^\circ\) = 103 kcal mol^\(-\)1

For the following reaction

CH₄(g) + Cl₂(g) \(\buildrel {light} \over \longrightarrow\) CH₃Cl(g) + HCl (g)

the correct statement is