Question 1

Which of the following statements best describes an organic molecule?

Accepted Answer

A molecule that contains a mixture of carbon and hydrogen atoms, and may also contain other elements.

Question 2

Which principle states that electrons fill orbitals of lowest energy first?

Accepted Answer

Aufbau Principle

Question 3

What is the formal charge on the oxygen atom in the molecule $$\mathrm{H_2CO}$$?

Accepted Answer

$$0$$

Question 4

Which of the following molecules violates the octet rule?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 5

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule $$\mathrm{C_2H_4} ($$ethylene)?

Accepted Answer

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

Question 6

Which of the following best describes the molecular geometry of $$\mathrm{NH_3$}$$ according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 7

What is the hybridization of the central carbon atom in $$\mathrm{CO_2$}$$?

Accepted Answer

$$sp$$

Question 8

Which of the following molecules contains a net dipole moment?

Accepted Answer

$$\mathrm{CH_3Cl}$$

Question 9

Which of the following is NOT a functional group in organic chemistry?

Accepted Answer

Carboxyl

Question 10

What is the major contributor to the resonance hybrid of the formate ion ($$\mathrm{$$HCO_2$$^-}$$)?

Accepted Answer

The structure with a negative charge on one oxygen and a double bond to the other oxygen.

Question 11

Which of the following best describes the Pauli Exclusion Principle?

Accepted Answer

No two electrons in an atom can have the same set of four quantum numbers.

Question 12

Which of the following is the correct condensed structural formula for ethanol?

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$

Question 13

Which of the following molecules has a linear geometry?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 14

What is the formal charge on the nitrogen atom in $$\mathrm{NH_4$^+}$$?

Accepted Answer

$$0$$

Question 15

Which of the following is a correct statement about resonance structures?

Accepted Answer

Resonance structures are different ways to distribute electrons in the same molecule.

Question 16

Which of the following atoms is most likely to violate the octet rule in its compounds?

Accepted Answer

Boron

Question 17

What is the bond angle in a molecule with $$sp^3$$ hybridization and no lone pairs on the central atom?

Accepted Answer

$$109.5^\circ$$

Question 18

Which of the following is the correct formula for calculating formal charge?

Accepted Answer

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

Question 19

Which of the following molecules contains a triple bond?

Accepted Answer

$$\mathrm{C_2H_2}$$

Question 20

Which of the following is a correct statement about sigma ($$\sigma) $$and pi ($$\pi) $$bonds?

Accepted Answer

A triple bond consists of one $$\sigma$$ bond and two $$\pi$$ bonds.

Chemical Bonding and Molecular Shapes: Study Notes

Study Guide - Practice Questions