Con.......ch 4

A molecule has one carbon-carbon double bond and four monovalent atoms or groups. How many different cis-trans isomers exist for this molecule?

None

Pharmaceutical companies are selling billions of dollars' worth of single-enantiomer drugs. Why might it be important to use only one form of an enantiomer?

A. It is not important. Both enantiomers will be equally effective.

B.It is cheaper to manufacture only one of the enantiomers.

C. The left-handed version of the enantiomer is always the effective one.

D. One enantiomer may provide an effective treatment whereas the other may be ineffective or even toxic.

Which of the following functional groups is present in all amino acids?

—SH

�OH

�COH

�NH2

Which of these is found in all amino acids?

A. —COOH

B. —OH

C. —NH2

D. both —COOH and —NH2

Ethanol, propanol, and methanol are three simple alcohols. They can be grouped together because they __________.

A. Increase the acidity of solutions

B. All contain a carbonyl group

D. Share the same functional group: a hydroxyl

C. Are soluble in water

Which of the following molecules is a weak base?

A. R—NH2

B . R—COOH

C. R—SH

D. R—OH

Which of the following functional groups increases the solubility of organic compounds in water?

Which of the following examples best describes a unique functional property of the carboxyl group?

A. Its compounds may be structural isomers with different properties.

B. It is polar as a result of the electronegative oxygen atom drawing electrons toward it.

C. Two carboxyl groups can bond covalently to help stabilize protein structure.

D. The covalent bond between oxygen and hydrogen is so polar that hydrogen ions tend to dissociate from oxygen reversibly

Which of the following functional groups is associated with a release of energy when removed from the carbon skeleton with water?

A. Phosphate group

B. Carboxyl group

C. Amino group

D. Sulfhydryl group

Which functional group would you predict is part of abscisic acid?

A. Amino group

B. Hydroxyl group

C. Carbonyl group

D. Carboxyl group

Con.......ch 4

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