Question 1

Which property of carbon most directly explains its ability to form large, complex, and diverse molecules essential for life?

Accepted Answer

Its four valence electrons, allowing it to form up to four covalent bonds

Question 2

Methane ($$CH_4) $$has a tetrahedral geometry. Which statement best explains this molecular shape?

Accepted Answer

The four hydrogen atoms repel each other equally around the central carbon atom

Question 3

Which of the following molecules is most likely to be hydrophobic?

Accepted Answer

A hydrocarbon chain such as hexane ($$C_6H_{14})$$

Question 4

Which of the following best describes a functional group in organic chemistry?

Accepted Answer

A group of atoms that determines the physical and chemical properties of an organic molecule

Question 5

A molecule with the formula $$C_2H_4 is $$known as ethene (ethylene). What type of bond exists between the two carbon atoms?

Accepted Answer

A double covalent bond

Question 6

Which of the following statements about carbon skeletons is FALSE?

Accepted Answer

They are always hydrophilic

Question 7

Which element is NOT commonly bonded to carbon in biological molecules?

Accepted Answer

Sodium

Question 8

A molecule contains both polar and non-polar covalent bonds. Which property is most likely affected by this combination?

Accepted Answer

Its ability to dissolve in water

Question 9

Which of the following is a correct statement about macromolecules?

Accepted Answer

They are large and complex organic molecules found in living organisms

Question 10

Which of the following best explains why dopamine, a neurotransmitter, can interact with water in the brain?

Accepted Answer

It contains polar functional groups that form hydrogen bonds with water

Question 11

Which of the following is the correct Lewis dot structure for a carbon atom?

Accepted Answer

C with four dots around it

Question 12

Which of the following best describes the difference between ethane ($$C_2H_6) $$and ethene ($$C_2H_4$$)?

Accepted Answer

Ethane has only single bonds, ethene has a double bond between carbons

Question 13

Which of the following is a real-world example of a molecule with a non-polar covalent bond?

Accepted Answer

Methane ($$CH_4)$$

Question 14

Which of the following functional groups is most likely to make a molecule act as a base in water?

Accepted Answer

Amino group ($$-NH_2$)

Question 15

A patient is given a drug that contains a carboxyl group ($$-COOH). $$What property will this group most likely confer to the drug?

Accepted Answer

It will act as an acid and donate protons in solution

Question 16

Which of the following best explains why hydrocarbons are generally insoluble in water?

Accepted Answer

They contain non-polar covalent bonds

Question 17

Which of the following is NOT a way that carbon skeletons can vary?

Accepted Answer

Ability to form ionic bonds

Question 18

Which of the following statements about the valence of carbon is correct?

Accepted Answer

Carbon has a valence of 4, meaning it can form four covalent bonds

Question 19

Which of the following best describes the role of functional groups in biological molecules?

Accepted Answer

They determine the chemical reactivity and properties of the molecule

Question 20

A molecule with the formula $$C_3H_7NO_2 is $$found to be an amino acid. Which functional groups must it contain?

Accepted Answer

Amino ($$-NH_2$) and carboxyl (-$$COOH$$) groups

Carbon Chemistry and Molecular Diversity in Biology

Study Guide - Practice Questions