Question 1

Which property of carbon makes it the ideal building block for complex biological molecules?

Accepted Answer

It can form stable covalent bonds with up to four other atoms, allowing for diverse molecular structures.

Question 2

Which of the following is NOT a possible bonding combination for a carbon atom to complete its octet?

Accepted Answer

Three double bonds

Question 3

A molecule with the formula $$C_4H_{10}$$ can exist as two different compounds: n-butane and isobutane. What is the relationship between these two compounds?

Accepted Answer

They are isomers.

Question 4

Which of the following statements about chiral molecules is TRUE?

Accepted Answer

Chiral molecules cannot be superimposed on their mirror images.

Question 5

How many stereoisomers are possible for a molecule with three chiral centers?

Accepted Answer

$$2^3 = 8$

Question 6

Why do geometric (cis/trans) isomers exist in alkenes but not in alkanes?

Accepted Answer

Alkanes have free rotation around single bonds, while alkenes have restricted rotation around double bonds.

Question 7

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

Accepted Answer

A carboxyl group and an amine group

Question 8

Which of the following best explains why small aldehydes and ketones are soluble in water?

Accepted Answer

They can form hydrogen bonds with water due to their polar carbonyl group.

Question 9

Which of the following correctly ranks the boiling points of the following compounds (all with similar molecular weights): ethane, ethanol, ethanal?

Accepted Answer

Ethanol \u003e ethanal \u003e ethane

Question 10

A student attempts to dissolve a long-chain carboxylic acid in water and observes poor solubility. What chemical treatment would increase its solubility?

Accepted Answer

Add a strong base to form a carboxylate salt.

Question 11

Which of the following reactions is responsible for the formation of an ester from a carboxylic acid and an alcohol?

Accepted Answer

Condensation reaction

Question 12

Which of the following statements about amines is FALSE?

Accepted Answer

Amines are generally non-polar and insoluble in water.

Question 13

Which of the following best describes the amphiphilic nature of soap molecules?

Accepted Answer

They have both a polar (ionic) carboxylate end and a non-polar hydrocarbon tail.

Question 14

Which functional group is responsible for the high boiling point of carboxylic acids compared to alcohols and ketones of similar size?

Accepted Answer

The ability to form two hydrogen bonds per pair of molecules

Question 15

Which of the following is a correct statement about the structure of benzene?

Accepted Answer

All C–C bonds in benzene are of equal length, intermediate between single and double bonds.

Question 16

A molecule contains a carbonyl group bonded to two alkyl groups. Which class of compound does it belong to?

Accepted Answer

Ketone

Question 17

Which of the following best explains why tertiary amines have lower boiling points than primary or secondary amines of similar size?

Accepted Answer

Tertiary amines lack N–H bonds and cannot form hydrogen bonds with each other.

Question 18

Which of the following is a correct description of a condensation reaction in biological systems?

Accepted Answer

A reaction in which two molecules combine to form a larger molecule, releasing water as a byproduct.

Question 19

Which of the following functional groups is found in the backbone of DNA and RNA?

Accepted Answer

Phosphodiester

Organic Chemistry Foundations for Biochemistry and Microbiology

Study Guide - Practice Questions

Study Guide - Flashcards