Question 1

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n = 2,\ l = 2,\ m_l = 0,\ m_s = +\frac{1}{2}$$

Question 2

Given the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^5$$, which element is described?

Accepted Answer

Fluorine

Question 3

A compound contains 40.0% C, 6.7% H, and 53.3% O by mass. What is its empirical formula?

Accepted Answer

$$CH_2O$$

Question 4

What is the formal charge on boron in the Lewis structure of $$BF_4$$^-$$?

Accepted Answer

$$+1$$

Question 5

Which of the following is the best resonance contributor for the enolate ion $$CH_3COCH_2^-$$?

Accepted Answer

The structure with the negative charge on the oxygen atom

Question 6

What is the hybridization of the central carbon in $$CO_2$$?

Accepted Answer

$$sp$$

Question 7

Rank the following in order of increasing acidity: $$H_2O$$, $$CH_3COOH$$, $$H_2SO_4$$, $$HF$$, $$NH_3$$, $$CH_3OH$$, $$H_3O^+.$$

Accepted Answer

$$NH_3$$ \u003c H_2O \u003c CH_3OH \u003c CH_3COOH \u003c HF \u003c H_3O^+ \u003c H_2SO_4$$

Question 8

Calculate the pH of a 1 M solution of a weak acid with $$pK_a = 3.18.$$

Accepted Answer

$$pH = 1.59$$

Question 9

Which side is favored in the equilibrium: $$C_6H_5COOH + OH^- \rightleftharpoons C_6H_5COO^- + H_2O$$?

Accepted Answer

Products

Question 10

Which Newman projection represents the most stable conformation for ethane?

Accepted Answer

Staggered

Question 11

What is the correct IUPAC name for the following structure: $$	ext{(CH}_3)_3CCH_2CH_2CH_3$$?

Accepted Answer

2,2,3-Trimethylbutane

Question 12

Which is the most stable chair conformation for methylcyclohexane?

Accepted Answer

Methyl group in the equatorial position

Question 13

Which of the following is the correct structure for cis-1,2-dimethylcyclohexane?

Accepted Answer

One methyl axial, one methyl equatorial on the same side

Question 14

Which of the following is the correct hybridization for the nitrogen atom in $$NH_3$$?

Accepted Answer

$$sp^3$$

Question 15

Which of the following is the correct resonance structure for the acetate ion ($$CH_3COO^-$$)?

Accepted Answer

One oxygen has a double bond, the other has a single bond and a negative charge

Question 16

Which of the following is the correct order of increasing base strength: $$NH_3$$, $$OH^-$$, $$CH_3O^-$$?

Accepted Answer

$$NH_3$$ \u003c OH^- \u003c CH_3O^-$$

Question 17

Which of the following is the correct Lewis structure for $$(CH_3$)_2NH_2^+Cl^-$$?

Accepted Answer

Nitrogen with four bonds and a positive charge, chloride with a negative charge

Question 18

Which of the following is the correct IUPAC name for the structure shown: $$	ext{(see image with tert-butyl and isopropyl on cyclohexane)}$$?

Accepted Answer

1-tert-butyl-4-isopropylcyclohexane

Question 19

Which of the following is the correct major resonance contributor for the cyclohexanone enolate?

Accepted Answer

The structure with the negative charge on the oxygen atom

Organic Chemistry I: Structure, Bonding, Resonance, Hybridization, Acids/Bases, and Molecular Representations

Study Guide - Practice Questions