Chem 334 - Summer 1998 - Organic Chemistry I Dr. Carl C. Wamser

Pre-Quiz 3 (Chapter 3.5 - 3.10)

1. (1 pt) The order of reactivity of the halogens towards alkanes is

MOST-------------->LEAST

F > Cl > Br > I

2. (1 pt) The order of reactivity of alkane C-H bonds towards halogens is

MOST-------------------->LEAST

tertiary C-H > secondary C-H > primary C-H > methyl-H

3. (1 pt) The initiation step in a free radical chlorination is

Cl2 -----> 2 Cl

4. (2 pts) The Hammond Postulate states that the transition state of an exothermic reaction is "early", meaning that it is similar in structure to

reactants

In contrast, the transition state of an endothermic reaction is considered "late", meaning that it is similar in structure to

products