Question 1

Which of the following statements best explains why benzene is more stable than expected based on simple alkene hydrogenation data?

Accepted Answer

Benzene's stability is due to resonance stabilization and delocalization of $$\pi$$ electrons over the ring.

Question 2

Which of the following is the correct order of reactivity for electrophilic aromatic substitution (EAS) reactions for the following compounds: toluene, benzene, and nitrobenzene?

Accepted Answer

Toluene \u003e Benzene \u003e Nitrobenzene

Question 3

Which of the following statements about the stability of carbocations is correct?

Accepted Answer

Carbocation stability increases with increasing alkyl substitution due to hyperconjugation and inductive effects.

Question 4

Which of the following is the major product when benzene reacts with bromine ($$\mathrm{Br_2$}) in $$the presence of iron(III) bromide ($$\mathrm{$$FeBr_3$$}$$)?

Accepted Answer

Bromobenzene

Question 5

A chemist wants to synthesize acetophenone from benzene. Which sequence of reactions would achieve this goal?

Accepted Answer

Friedel-Crafts alkylation with methyl chloride followed by oxidation

Question 6

Which of the following substituents is an electron-withdrawing group that deactivates the benzene ring toward electrophilic aromatic substitution and directs new substituents to the meta position?

Accepted Answer

$$-\mathrm{NO_2$}$$

Question 7

Which of the following best describes the product of the reaction between an alkene and cold, dilute potassium permanganate ($$\mathrm{$$KMnO_4$$}$$)?

Accepted Answer

The alkene is oxidized to a diol.

Question 8

Which of the following statements about the Diels-Alder reaction is correct?

Accepted Answer

It forms a six-membered ring by the concerted reaction of a diene and a dienophile.

Question 9

Which of the following is the correct product when aniline ($$\mathrm{C_6H_5NH_2}) is $$treated with bromine water ($$\mathrm{Br_2$} in$$ $$\mathrm{H_2O}) at $$room temperature?

Accepted Answer

2,4,6-tribromoaniline

Question 10

Which of the following statements about the acidity of phenols compared to alcohols is correct?

Accepted Answer

Phenols are more acidic than alcohols because the phenoxide ion is stabilized by resonance.

Question 11

Which of the following is the correct order of basicity for the following amines in aqueous solution: aniline, methylamine, and ammonia?

Accepted Answer

Methylamine \u003e Ammonia \u003e Aniline

Question 12

Which of the following reagents can be used to convert a carboxylic acid to an acid chloride?

Accepted Answer

$$\mathrm{$$SOCl_2$$}$$

Question 13

Which of the following best describes the mechanism of nucleophilic acyl substitution in the formation of an ester from a carboxylic acid and an alcohol?

Accepted Answer

The alcohol acts as a nucleophile and attacks the carbonyl carbon, followed by elimination of water.

Question 14

Which of the following statements about the orientation of electrophilic aromatic substitution is correct?

Accepted Answer

Electron-donating groups direct new substituents to the ortho and para positions.

Question 15

Which of the following is the correct product when benzaldehyde is oxidized with potassium permanganate ($$\mathrm{$$KMnO_4$$}$$)?

Accepted Answer

Benzoic acid

Question 16

Which of the following best explains why tertiary alkyl halides undergo $$S_N1$$ reactions faster than primary alkyl halides?

Accepted Answer

Tertiary carbocations are more stable due to greater alkyl group stabilization.

Question 17

Which of the following is the correct product when an amide is treated with aqueous acid under reflux?

Accepted Answer

Carboxylic acid and ammonium ion

Question 18

Which of the following is the correct IUPAC name for the compound $$\mathrm{CH_3CH_2NH_2}$$?

Accepted Answer

Ethanamine

Question 19

Which of the following reactions is used to synthesize primary amines from alkyl halides?

Accepted Answer

Gabriel synthesis

Question 20

Which of the following best describes the product of the reaction between an acid chloride and ammonia?

Accepted Answer

An amide

Organic Chemistry II: Final Exam Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard