Chapter 15, Problem 15.77P

Interpretation Introduction

(a)

Interpretation: An explanation for higher stability of triphenylmethyl radical than other radicals is to be stated.

Concept introduction: The delocalization of lone pair or free electrons from one place to another is known as resonance. The stability of compound depends upon the number of resonating structures. More the resonating structures of compound more will be its stability.

Interpretation Introduction

(b)

Interpretation: The dimerization of two triphenylmethyl radicals to form A is to be represented by the use of curved arrow notation.

Concept introduction: The delocalization of lone pair or free electrons from one place to another is known as resonance. The stability of compound depends upon the number of resonating structures. More the resonating structures of compound more will its stability.

Interpretation Introduction

(c)

Interpretation: A reason for the formation of A rather than hexaphenylethane is to be proposed.

Concept introduction: The chemical reaction which proceeds through the formation of radicals is known as chain reaction. It involves three steps, initiation, propagation and termination.

Interpretation Introduction

(d)

Interpretation: An explanation of the use of ${}^{\text{1}}\text{H}$ and ${}^{\text{13}}\text{C}$ NMR spectroscopy to distinguish between hexaphenylethane and A is to be stated.

Concept introduction: Spectroscopy method is used to identify the structure of the molecule. It is based on the interactions between matter and electromagnetic radiations. Proton NMR spectroscopy identifies the number of hydrogen atoms present in a molecule and the nature of the functional group. The value of chemical peaks depends upon the chemical environment around the hydrogen atom.