Chapter 3, Problem 45P

(a)

Interpretation Introduction

Interpretation: The diagram for comparison of reactions of bromine radical with primary and secondary hydrogens of propane needs to be drawn.

Concept Introduction: The primary hydrogen atom in an alkane is the atom bonded to the terminal carbon atom. Whereas, the secondary hydrogen atom is hydrogen atom bonded to the central or non-terminal carbon atoms in an alkane.

(b)

Interpretation Introduction

Interpretation: The transition state which is early and which is late needs to be identified.

Concept Introduction: The primary hydrogen atom in an alkane is the atom bonded to the terminal carbon atom. Whereas, the secondary hydrogen atom is hydrogen atom bonded to the central or non-terminal carbon atoms in an alkane.

(c)

Interpretation Introduction

Interpretation: The transition state in case of bromine radical will show a greater or lesser radical character than the chlorine radical needs to be determined.

Concept Introduction: The primary hydrogen atom in an alkane is the atom bonded to the terminal carbon atom. Whereas, the secondary hydrogen atom is hydrogen atom bonded to the central or non-terminal carbon atoms in an alkane.

(d)

Interpretation Introduction

Interpretation: Whether the answer in part (c) is consistent with the selectivity difference between the reaction of chloride and bromide radical and propane or not needs to be explained.

Concept Introduction: The primary hydrogen atom in an alkane is the atom bonded to the terminal carbon atom. Whereas, the secondary hydrogen atom is hydrogen atom bonded to the central or non-terminal carbon atoms in an alkane.