Question 1

Which of the following statements best describes the difference between an SN1 and an SN2 reaction mechanism?

Accepted Answer

SN1 reactions involve a two-step mechanism with a carbocation intermediate, while SN2 reactions proceed via a single concerted step.

Question 2

A student is asked to synthesize 2-bromopropane from propene. Which of the following sequences would achieve this transformation?

Accepted Answer

React propene with $$\mathrm{HBr} (no $$peroxides).

Question 3

Which of the following best explains why tertiary alcohols are more reactive than primary alcohols in acid-catalyzed dehydration reactions?

Accepted Answer

Tertiary alcohols form more stable carbocations during the reaction.

Question 4

Which of the following IR absorption bands would you expect to see for a compound containing a carbonyl group ($$\mathrm{C=O}$$)?

Accepted Answer

$$\mathrm{1700\ cm$$^{-1}$$}$$

Question 5

A chemist wants to distinguish between 1-butanol and 2-butanone using IR spectroscopy. Which region of the IR spectrum should they focus on?

Accepted Answer

The $$\mathrm{3300\ cm$$^{-1}$$}$$ region for O-H stretch.

Question 6

Which of the following statements about the Markovnikov rule is correct?

Accepted Answer

It predicts that the electrophile adds to the more substituted carbon of the alkene.

Question 7

Which of the following is the best example of a Lewis acid?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 8

A student mixes 2-chloropropane with aqueous NaOH. Which type of reaction mechanism is most likely to occur, and what is the major product?

Accepted Answer

SN1 mechanism; 2-propanol

Question 9

Which of the following best describes the stereochemistry of the product formed in the bromination of (E)-2-butene with $$\mathrm{Br_2$} in$$ $$\mathrm{$$CCl_4$$}$$?

Accepted Answer

A pair of enantiomers (anti addition)

Question 10

Which of the following is the correct order of increasing acidity for the following compounds: ethanol, acetic acid, phenol?

Accepted Answer

Ethanol \u003c phenol \u003c acetic acid

Question 11

A patient is exposed to methanol. Which of the following best explains why methanol is toxic in the human body?

Accepted Answer

Methanol is converted to formaldehyde and formic acid, which are toxic metabolites.

Question 12

Which of the following statements about the E2 elimination reaction is correct?

Accepted Answer

The E2 reaction requires a strong base and is concerted.

Question 13

Which of the following best describes the hybridization of the central carbon atom in acetylene ($$\mathrm{C_2H_2}$$)?

Accepted Answer

$$\mathrm{sp}$$

Question 14

A chemist needs to synthesize tert-butyl chloride from tert-butyl alcohol. Which reagent and conditions should be used?

Accepted Answer

$$\mathrm{HCl}$$, room temperature

Question 15

Which of the following statements about aromaticity is correct?

Accepted Answer

Aromatic compounds must have a planar, cyclic structure with $$4n+2$$ $$\pi$$ electrons.

Question 16

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

Accepted Answer

1-bromopropane

Question 17

A student is asked to propose a multistep synthesis of 2-methyl-2-butanol from 2-methylpropene. Which of the following sequences is correct?

Accepted Answer

React 2-methylpropene with $$\mathrm{H_2SO_4}$$ and $$\mathrm{H_2O}$$, then react with $$\mathrm{CH_3MgBr}$$ followed by acid workup.

Question 18

Which of the following best explains why alkenes react with bromine ($$\mathrm{Br_2$}) to $$give vicinal dibromides?

Accepted Answer

The alkene acts as a nucleophile and attacks $$\mathrm{Br_2$}$$, forming a bromonium ion intermediate.

Question 19

Which of the following statements about the use of FTIR spectroscopy in organic chemistry is correct?

Accepted Answer

FTIR can be used to identify functional groups based on their characteristic absorption frequencies.

CHE 201: Organic Chemistry I – Syllabus and Course Overview

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