5 $$\\sigma-$$bonds and 1 $$\\pi-$$bond

Question 1

Which of the following best describes an organic molecule?

Accepted Answer

A molecule that contains both carbon and hydrogen.

Question 2

Which molecule is considered a hydrocarbon?

Accepted Answer

C$$_6H$_6$$

Question 3

Isotopes of an element have:

Accepted Answer

The same atomic number but different mass numbers.

Question 4

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 5

What is the electron configuration for carbon (atomic number 6)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 6

Which of the following statements about molecular orbitals is correct?

Accepted Answer

Constructive interference of atomic orbitals forms bonding molecular orbitals.

Question 7

In the acetylcholinesterase reaction, acetylcholine is broken down into:

Accepted Answer

Acetic acid and choline

Question 8

Which bond is shortest among single, double, and triple bonds?

Accepted Answer

Triple bond

Question 9

How many $$\sigma-$$bonds and $$\pi-$$bonds are present in ethene (C$$_2H$_4$$)?

Accepted Answer

5 $$\sigma-$$bonds and 1 $$\pi-$$bond

Question 10

Which element can have an expanded octet?

Accepted Answer

Phosphorus

Question 11

What is the formal charge on the oxygen atom in a hydroxide ion (OH$$^-$$)?

Accepted Answer

$$-1$$

Question 12

Which of the following violates the octet rule?

Accepted Answer

BF$$_3$$

Question 13

What is the net charge of a molecule if the sum of all formal charges is $$-1$$?

Accepted Answer

The molecule has a net charge of $$-1.$$

Question 14

In skeletal structures, which atoms are implied at every corner unless otherwise specified?

Accepted Answer

Carbon

Question 15

Which quantum mechanical principle states that we cannot simultaneously know an electron’s speed and position?

Accepted Answer

Heisenberg Uncertainty Principle

Question 16

Which of the following is a real-world example of an organic molecule used in biological systems?

Accepted Answer

Acetylcholine

Question 17

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

Accepted Answer

$$-1$$

Question 18

Which of the following best describes a $$\pi-$$bond?

Accepted Answer

A bond formed by side-to-side overlap of p orbitals.

Question 19

Which principle is violated if two electrons in the same orbital have the same spin?

Accepted Answer

Pauli Exclusion Principle

General Chemistry Foundations for Organic Chemistry: Atomic Structure, Bonding, and Molecular Representation

Study Guide - Practice Questions