Chapter 11.1, Problem 2LTS

Interpretation Introduction

Interpretation:

The weakest $\text{CH}$ bond present in the given compound should be identified.

Concept introduction:

Radical or free radical: The unpaired valence electron of an atom, molecule, or ion is called as radical. The stability order for radical is as follows,

$\text{benzylic}\text{>}\text{allylic}\text{>}\text{tertiary}\text{>}\text{secondary}\text{>}\text{primary}\text{>}\text{methyl}$

Resonance: The molecule is said to have resonance structures if it has more than one structure by migrating lone pair, radical or the phi bonds present in the molecule.

Resonance stabilization: Due to the delocalization of electrons within the molecule the overall energy becomes lower and makes the molecule more stable.

Bond strength present in the molecule depends on the formation of the radical, if the radical formed is resonance stabilized then the bond associated with it is weak than the other bond present in the molecule.