Question 1

Which of the following best describes a Lewis acid?

Accepted Answer

A species that accepts a pair of electrons.

Question 2

Which of the following molecules has sp$^2$ hybridization at the central atom?

Accepted Answer

BF$_3$

Question 3

What is the bond angle in a molecule with tetrahedral geometry?

Accepted Answer

$109.5^\circ$

Question 4

Which of the following is the correct Lewis structure for the nitrate ion, NO$_3^-$?

Accepted Answer

A nitrogen atom double bonded to one oxygen and single bonded to two other oxygens, with resonance among the oxygens and a negative charge delocalized.

Question 5

Which statement correctly differentiates between sigma ($\sigma$) and pi ($\pi$) bonds?

Accepted Answer

$\sigma$ bonds result from end-to-end overlap of orbitals, while $\pi$ bonds result from side-to-side overlap.

Question 6

Which of the following compounds is the strongest acid?

Accepted Answer

CH$_3$COOH

Question 7

Predict which of the following molecules will have the highest boiling point: CH$_4$, CH$_3$CH$_2$OH, CH$_3$COOH, or CH$_3$CH$_2$CH$_3$.

Accepted Answer

CH$_3$COOH

Question 8

Which of the following statements about resonance structures is correct?

Accepted Answer

The actual molecule is a hybrid of all possible resonance structures.

Question 9

How many hydrogens are bonded to the central carbon in propane (C$_3$H$_8$)?

Accepted Answer

3

Question 10

Which of the following is a correct IUPAC name for the compound shown: CH$_3$CH$_2$CH$_2$CH$_3$?

Accepted Answer

Butane

Question 11

Which of the following is a primary amine?

Accepted Answer

CH$_3$NH$_2$

Question 12

Which of the following statements about cyclohexane chair conformations is correct?

Accepted Answer

Equatorial substituents are generally more stable due to less steric hindrance.

Question 13

Which of the following is the correct order of acidity (from strongest to weakest) for the following: H$_2$O, CH$_3$COOH, NH$_3$, CH$_4$?

Accepted Answer

CH$_3$COOH > H$_2$O > NH$_3$ > CH$_4$

Question 14

Which of the following is a secondary alcohol?

Accepted Answer

CH$_3$CHOHCH$_3$

Question 15

Which of the following statements about hybridization is correct?

Accepted Answer

An sp$^2$ hybridized atom forms one pi bond and two sigma bonds.

Question 16

Which of the following is the correct condensed formula for isopropyl alcohol?

Accepted Answer

CH$_3$CHOHCH$_3$

Question 17

Which of the following is a tertiary amine?

Accepted Answer

CH$_3$N(CH$_3$)$_2$

Question 18

Which of the following best explains why acetic acid (CH$_3$COOH) is a stronger acid than ethanol (CH$_3$CH$_2$OH)?

Accepted Answer

The carboxylate ion formed after deprotonation is stabilized by resonance.

Question 19

Which of the following is the correct IUPAC name for the compound CH$_3$CH$_2$CH$_2$NH$_2$?

Accepted Answer

Propylamine

Question 20

Which of the following statements about the stability of cyclohexane conformations is correct?

Accepted Answer

The chair conformation is the most stable due to minimized torsional and steric strain.

Organic Chemistry Midterm I Study Guide: Key Concepts and Skills

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