Question 1

Which of the following statements best explains why alkyl halides are commonly used as solvents in chemical reactions?

Accepted Answer

They are often polar and can dissolve a wide range of organic and inorganic compounds, making them versatile solvents.

Question 2

DDT is classified as both an alkyl halide and an aryl halide. Which structural feature allows DDT to be considered an aryl halide?

Accepted Answer

It contains a halogen atom directly bonded to a benzene ring.

Question 3

Which of the following is the correct IUPAC name for CH$$_2Cl$_2$$?

Accepted Answer

Methylene chloride

Question 4

In the molecule chloromethane, the carbon–chlorine bond is polar. Which atom carries the partial negative charge?

Accepted Answer

Chlorine

Question 5

Which of the following best describes the rate law for an S$$_N2 $$reaction?

Accepted Answer

rate = k[R-X][Nu]

Question 6

What is the stereochemical outcome of an S$$_N2 $$reaction at a chiral center?

Accepted Answer

Inversion of configuration (Walden inversion)

Question 7

Which of the following nucleophiles is the strongest in polar protic solvents?

Accepted Answer

$$I^-$$

Question 8

Which substrate is most likely to undergo an S$$_N1 $$reaction?

Accepted Answer

A tertiary alkyl halide

Question 9

What is the major product of an E2 elimination of 2-bromo-2-methylbutane with potassium tert-butoxide?

Accepted Answer

The least substituted alkene (Hofmann product)

Question 10

Which of the following statements about E2 elimination on cyclohexane is correct?

Accepted Answer

The leaving group and the hydrogen to be abstracted must both be axial for the reaction to occur.

Question 11

Which of the following is a good leaving group for nucleophilic substitution reactions?

Accepted Answer

Tosylate ($$OTs)$$

Question 12

According to Zaitsev's rule, which alkene will be the major product in an elimination reaction?

Accepted Answer

The more highly substituted alkene

Question 13

Which of the following solvents would best promote an S$$_N2 $$reaction?

Accepted Answer

Acetone (polar aprotic)

Question 14

What is the effect of a bulky base in an E2 elimination reaction?

Accepted Answer

It favors formation of the less substituted alkene (Hofmann product).

Question 15

Which of the following is a violation of Bredt’s rule?

Accepted Answer

A double bond at a bridgehead position in a bicyclic compound with a six-membered ring.

Question 16

Which of the following best describes the first step in both S$$_N1 $$and E1 mechanisms?

Accepted Answer

Formation of a carbocation intermediate

Question 17

Which of the following is true about carbocation rearrangements?

Accepted Answer

Carbocations will rearrange only to form a more stable carbocation.

Question 18

Which of the following is the correct order of reactivity for alkyl halides in S$$_N2 $$reactions?

Accepted Answer

Methyl \u003e 1° \u003e 2° \u003e 3°

Question 19

Which of the following is a common use of alkyl halides in industry?

Accepted Answer

As refrigerants (e.g., Freons, CFCs)

Question 20

Which of the following statements about the dehydration of alcohols is correct?

Accepted Answer

Tertiary alcohols dehydrate faster than secondary or primary alcohols due to carbocation stability.

Alkyl Halide Chemistry: Properties, Nomenclature, and Reactivity

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