What reactive species is produced in the initiation step of the free radical chlorination of 2,2-dimethylpropane?

A) a chlorine atom
B) a chlorine radical anion
C) a carbon radical
D) a carbocation

What does a value of 1.50 × 10⁴ for an equilibrium constant indicate about the reaction?

A) The equilibrium lies far to the reactants side.
B) The equilibrium is roughly equal amounts of products and reactants.
C) The equilibrium lies far to the products side.
D) The number does not indicate anything about the equilibrium.

Which of the following reagents is used to protect the amino group of the N-terminal residue in solution-phase peptide synthesis?

A) lithium diisopropyl amide
B) benzyl chloroformate
C) phenyl isothiocyanate
D) dicyclohexylcarbodiimide
E) trifluoroacetic acid

Circle the coplanar atoms in 1-ethylcyclopentene shown below.

What kind of catalyst is always in the same physical state as the reactant?

A) Heterogeneous catalyst
B) Iron catalyst
C) Homogeneous catalyst
D) Chemiluminescent catalyst

What is the SI unit of heat energy?

A) The joule
B) The calorie
C) The coulomb
D) The ºC

Suggest a sequence of synthetic steps through which p-toluic acid can be prepared from toluene.

Which of the following is an incorrect description of benzene?

A) The CCC bond angles are all equal to 120°.
B) The molecule is planar.
C) The molecule is a 6-membered ring which contains alternating single and double carbon-carbon bonds.
D) The molecule is aromatic.
E) The molecule can be drawn as a resonance hybrid of two Kekule structures.

How many compounds does crude oil contain?

A) About fifty
B) Hundreds
C) Thousands
D) Just one

Classify the compound below as aromatic, antiaromatic, or nonaromatic. Assume planarity of the π network.