Question 1

Which of the following best describes the formal charge on the oxygen atom in a hydroxide ion ($$\mathrm{OH^-}$$)?

Accepted Answer

The oxygen atom has a formal charge of $$-1.$$

Question 2

Which hybridization is present in the central carbon atom of ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

$$sp^2$$

Question 3

What is the major product when 2-bromopropane reacts with sodium hydroxide in ethanol under reflux?

Accepted Answer

Propene

Question 4

Which of the following statements about nucleophilic substitution reactions is correct?

Accepted Answer

SN2 reactions occur in a single step with simultaneous bond breaking and forming.

Question 5

In the reaction of benzene with bromine in the presence of iron(III) bromide, what type of reaction occurs?

Accepted Answer

Electrophilic aromatic substitution

Question 6

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

Accepted Answer

Both oxygen atoms share the negative charge equally through resonance.

Question 7

Which of the following is the strongest acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl})$$

Question 8

Which reagent would you use to convert an alkene to an alkane?

Accepted Answer

Hydrogen gas and a nickel catalyst

Question 9

What is the product of the reaction between 1-bromobutane and potassium cyanide ($$\mathrm{KCN}) in $$ethanol?

Accepted Answer

Butanenitrile ($$\mathrm{CH_3CH_2CH_2CH_2CN})$$

Question 10

Which of the following best explains why tertiary carbocations are more stable than primary carbocations?

Accepted Answer

Tertiary carbocations are stabilized by hyperconjugation and inductive effects from surrounding alkyl groups.

Question 11

Which of the following is a correct statement about the mechanism of electrophilic addition to alkenes?

Accepted Answer

The alkene acts as a nucleophile attacking the electrophile.

Question 12

Which of the following is the correct order of increasing acidity?

Accepted Answer

Phenol \u003c Acetic acid \u003c Hydrochloric acid

Question 13

Which of the following is a nucleophile in organic reactions?

Accepted Answer

Ammonia ($$\mathrm{NH_3$})$$

Question 14

What is the expected major product when 2-methylpropene reacts with hydrogen bromide ($$\mathrm{HBr}$$)?

Accepted Answer

2-bromo-2-methylpropane

Question 15

Which of the following is a correct statement about SN1 and SN2 mechanisms?

Accepted Answer

SN1 reactions involve a carbocation intermediate.

Question 16

Which of the following is the correct Lewis structure for formaldehyde ($$\mathrm{CH_2O}$$)?

Accepted Answer

Central carbon atom double bonded to oxygen and single bonded to two hydrogens.

Question 17

Which of the following is a correct statement about the strength of acids?

Accepted Answer

A strong acid has a low $$pK_a$$ value.

Question 18

Which of the following is a correct statement about the resonance in benzene?

Accepted Answer

Benzene has delocalized electrons over all six carbon atoms.

Question 19

Which of the following is the correct IUPAC name for the compound $$\mathrm{CH_3CH_2CH_2Br}$$?

Accepted Answer

1-bromopropane

Organic Chemistry Foundations: Essential Skills and Concepts

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