Question 1

Which of the following statements best explains why tertiary alkyl halides are formed preferentially during radical halogenation of alkanes?

Accepted Answer

Tertiary radicals are more stable than primary and secondary radicals due to hyperconjugation and alkyl group electron donation.

Question 2

During the radical chlorination of methane, which step is responsible for the formation of the methyl radical ($$CH_3$$\cdot$$)?

Accepted Answer

Propagation step 1

Question 3

Which reagent is commonly used for the selective bromination of allylic positions in alkenes?

Accepted Answer

NBS (N-bromosuccinimide) in CCl$$_4$$

Question 4

What is the major product when cyclohexene reacts with NBS in CCl$$_4$$?

Accepted Answer

3-Bromocyclohexene

Question 5

Which of the following best describes the electrophilic carbon in an alkyl halide?

Accepted Answer

It is the carbon directly bonded to the halogen and has a partial positive charge ($$\delta^+) $$due to the electronegativity of the halogen.

Question 6

Which of the following is the correct order of stability for alkyl radicals?

Accepted Answer

Primary \u003c Secondary \u003c Tertiary

Question 7

What is the product of the reaction between 2-butanol and PBr$$_3$$?

Accepted Answer

2-Bromobutane

Question 8

Which of the following organometallic reagents is used to form Grignard reagents?

Accepted Answer

Mg in ether

Question 9

In the Suzuki-Miyaura coupling reaction, which two types of reactants are required?

Accepted Answer

An aromatic halide and an aromatic boronic acid

Question 10

Which of the following best describes the change in oxidation level when methane ($$CH_4) is $$converted to chloromethane ($$CH_3Cl$$)?

Accepted Answer

The oxidation level increases because a C-H bond is replaced by a C-Cl bond.

Question 11

Which of the following is a correct IUPAC name for the compound shown: $$BrCH_2CH_2CH(CH_3$)CH_2CH_3$$?

Accepted Answer

1-Bromo-4-methylpentane

Question 12

Which of the following is NOT a typical use of organohalides in real-world applications?

Accepted Answer

As catalysts in Suzuki coupling reactions

Question 13

Which of the following statements about Grignard reagents is TRUE?

Accepted Answer

Grignard reagents are strong nucleophiles and bases, and react with water to form alkanes.

Question 14

Which of the following is the correct product of the reaction between 1-iododecane and lithium dimethylcopper ($$Li_2Cu(CH_3$)_2$$)?

Accepted Answer

Undecane

Question 15

Which of the following best explains why allylic bromination is more selective than direct bromination of alkenes?

Accepted Answer

Allylic radicals are stabilized by resonance, making their formation more favorable.

Question 16

Which of the following compounds has the highest oxidation level?

Accepted Answer

$$CH_3COCH_3$$

Question 17

Which of the following is a correct description of the propagation steps in radical halogenation?

Accepted Answer

They involve the formation and consumption of radicals, allowing the reaction to continue as a chain process.

Question 18

Which of the following is the correct product when cyclohexanol reacts with HF in pyridine?

Accepted Answer

Fluorocyclohexane

Question 19

Which of the following is a correct statement about the Suzuki-Miyaura coupling reaction?

Accepted Answer

It forms biaryl compounds by coupling aromatic halides with aromatic boronic acids using a palladium catalyst.

Question 20

Which of the following is the correct order of increasing oxidation level for the following compounds: $$CH_3CH_2CH_3$$, $$CH_3CH_2OH$$, $$CH_3COCH_3$$, $$CH_3CH_2Cl$$?

Accepted Answer

$$CH_3CH_2CH_3 \u003c CH_3CH_2OH \u003c CH_3CH_2Cl \u003c CH_3COCH_3$$

Chapter 10: Organohalides – Structures, Nomenclature, and Reactions

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