Question 1

Which of the following statements best explains why epoxides are significantly more reactive than ethers in nucleophilic substitution reactions?

Accepted Answer

Epoxides have a three-membered ring with a bond angle of $$60^\circ$$, causing significant ring strain that makes them highly reactive.

Question 2

Which of the following compounds is a secondary alcohol?

Accepted Answer

2-Propanol ($$\mathrm{CH_3CHOHCH_3})$$

Question 3

During the Williamson ether synthesis, which combination of reactants would be most efficient for preparing ethyl methyl ether?

Accepted Answer

Sodium methoxide ($$\mathrm{CH_3O^-}) $$and ethyl bromide ($$\mathrm{CH_3CH_2Br})$$

Question 4

Which of the following best describes the hybridization and geometry of the oxygen atom in an alcohol, ether, or epoxide?

Accepted Answer

sp$$^3$$ hybridized with a bent geometry due to two lone pairs

Question 5

When an epoxide is treated with a nucleophile under acidic conditions, which carbon does the nucleophile preferentially attack?

Accepted Answer

The more substituted carbon, due to partial positive charge stabilization

Question 6

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

Alcohols can form strong hydrogen bonds due to the presence of an O–H group, while ethers and epoxides cannot.

Question 7

Which reagent would NOT reduce a carboxylic acid to a primary alcohol?

Accepted Answer

Sodium borohydride ($$\mathrm{$$NaBH_4$$})$$

Question 8

A student attempts to cleave diethyl ether ($$\mathrm{CH_3CH_2OCH_2CH_3}) $$using concentrated HI. What is the expected major organic product?

Accepted Answer

Ethyl iodide ($$\mathrm{CH_3CH_2I})$$

Question 9

Which of the following best describes the order of reactivity toward nucleophilic substitution (SN2) for alcohols based on their degree?

Accepted Answer

Primary $$\u003e$$ Secondary $$\u003e$$ Tertiary

Question 10

Which of the following is the correct IUPAC name for the compound with the structure below?

A three-membered ring containing one oxygen atom, with two methyl groups attached to the same carbon in the ring.

Accepted Answer

1,1-Dimethyloxirane

Question 11

In the cleavage of methyl tert-butyl ether ($$\mathrm{(CH_3$)_3COCH_3}) $$with HI, which mechanism is favored for the tert-butyl group and why?

Accepted Answer

SN1, because the tert-butyl carbocation is stabilized by hyperconjugation and inductive effects

Question 12

Which of the following best describes the product(s) when an epoxide is opened with sodium methoxide ($$\mathrm{$$NaOCH_3$$}) in $$methanol?

Accepted Answer

Methoxy group adds to the less substituted carbon, and an alcohol forms on the more substituted carbon.

Question 13

Which of the following is the correct name for $$\mathrm{CH_3OCH_2CH_3}$$ using the alkoxy substituent nomenclature?

Accepted Answer

Methoxyethane

Question 14

A chemist wants to synthesize an ether using the Williamson ether synthesis. Which combination would be LEAST likely to succeed due to steric hindrance?

Accepted Answer

tert-Butyl bromide and sodium tert-butoxide

Question 15

Which of the following statements is TRUE regarding the use of $$\mathrm{$$NaBH_4$$}$$ and $$\mathrm{$$LiAlH_4$$} in $$organic reductions?

Accepted Answer

$$\mathrm{$$NaBH_4$$}$$ can reduce aldehydes and ketones, but not esters or carboxylic acids.

Question 16

Which of the following best explains why alcohols have higher boiling points than ethers of similar molecular weight?

Accepted Answer

Alcohols can form intermolecular hydrogen bonds, while ethers cannot.

Question 17

Which of the following is the correct order of reactivity toward nucleophilic attack?

Accepted Answer

Epoxide $$\u003e$$ Ether $$\u003e$$ Alcohol

Question 18

A chemist wants to open an epoxide ring in a molecule that also contains a tertiary alcohol. Which of the following conditions will ensure that the nucleophile attacks the less substituted carbon of the epoxide?

Accepted Answer

Basic conditions (e.g., $$\mathrm{$$NaOCH_3$$} in$$ $$\mathrm{CH_3OH})$$

Question 19

Which of the following is a symmetrical ether?

Accepted Answer

Diethyl ether ($$\mathrm{CH_3CH_2OCH_2CH_3})$$

Alcohols, Ethers, and Epoxides: Structure, Properties, and Reactions

Guida di studio - Domande di pratica

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