$$\text{Formal Charge} = \text{Group Number} - \text{Valence Electrons}$$

Question 1

Which of the following best describes an organic molecule?

Accepted Answer

A molecule that contains both carbon and hydrogen atoms.

Question 2

Which molecule is considered a hydrocarbon?

Accepted Answer

C$$_6H$_6$$

Question 3

The atomic number of an atom is equal to the number of:

Accepted Answer

Protons

Question 4

Isotopes of an element have:

Accepted Answer

The same atomic number and different mass numbers

Question 5

Which principle states that orbitals of equal energy are filled with electrons of the same spin before pairing occurs?

Accepted Answer

Hund's Rule

Question 6

What is the mass number of deuterium ($$^2_1H$$)?

Accepted Answer

$$2$$

Question 7

Which of the following is true about the Heisenberg Uncertainty Principle?

Accepted Answer

It states that we cannot simultaneously know an electron’s speed and position.

Question 8

What is the result of constructive interference between two atomic orbitals?

Accepted Answer

Formation of a bonding molecular orbital

Question 9

Which bond is composed of one sigma ($$\sigma) $$bond and two pi ($$\pi) $$bonds?

Accepted Answer

Triple bond

Question 10

Rank the following bonds from shortest to longest: single, double, triple.

Accepted Answer

Triple \u003c Double \u003c Single

Question 11

According to the octet rule, how many electrons do second-row elements (C, N, O, F) prefer to possess?

Accepted Answer

$$8$$

Question 12

Which element can form an expanded octet with up to 12 electrons?

Accepted Answer

Sulfur

Question 13

What is the formula for calculating the formal charge of an atom?

Accepted Answer

$$	ext{Formal Charge} = 	ext{Group Number} - 	ext{Valence Electrons}$$

Question 14

In the bondline method for organic structures, which atoms are implied at every corner?

Accepted Answer

Carbon

Question 15

Which of the following statements about acetylcholine hydrolysis by acetylcholinesterase is correct?

Accepted Answer

The reaction produces acetic acid and choline.

Question 16

If a carbon atom in a hydrocarbon has three bonds and one lone pair, what is its formal charge?

Accepted Answer

$$-1$$

Question 17

Which of the following is a violation of the Pauli Exclusion Principle?

Accepted Answer

Two electrons in the same orbital with the same spin

Question 18

Which of the following molecules violates the octet rule?

Accepted Answer

BF$$_3$$

Question 19

Which quantum mechanical concept explains why electrons can behave as both particles and waves?

Accepted Answer

Wave-Particle Duality

Question 20

In a line-angle structure, how are hydrogens on heteroatoms (such as oxygen and nitrogen) represented?

Accepted Answer

They must be drawn explicitly.

Foundations of General Chemistry for Organic Chemistry

Study Guide - Practice Questions