Q: Which IR absorption is characteristic of an O-H stretch in alcohols?

$$\sim 3300\ \text{cm}^{-1} ($$broad)

Question 1

Which of the following statements about atomic structure is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 2

Which hybridization state corresponds to a molecule with a linear geometry?

Accepted Answer

$$	ext{sp}$$

Question 3

What is the correct IUPAC name for the following compound: $$	ext{CH}_3	ext{CH}_2	ext{CH}_2	ext{OH}$$?

Accepted Answer

Propanol

Question 4

Which of the following best describes a sigma ($$\sigma) $$bond?

Accepted Answer

A bond formed by the end-to-end overlap of orbitals along the internuclear axis.

Question 5

Which of the following is a meso compound?

Accepted Answer

A compound with two chiral centers and a plane of symmetry.

Question 6

Assign the absolute configuration (R or S) to the following chiral center: a carbon attached to Br, Cl, CH$$_3$$, and H, with priorities Br \u003e Cl \u003e CH$$_3$$ \u003e H, and H is pointing away from you.

Accepted Answer

R

Question 7

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures differ only in the arrangement of electrons.

Question 8

Which compound is aromatic according to Hückel’s rule?

Accepted Answer

Benzene ($$C_6H_6)$$

Question 9

Which of the following factors increases the acidity of a compound?

Accepted Answer

Resonance stabilization of the conjugate base.

Question 10

Which of the following statements about SN2 reactions is correct?

Accepted Answer

The reaction rate depends on both the substrate and nucleophile concentrations.

Question 11

Which product is favored in an E2 elimination of 2-bromobutane with a strong base?

Accepted Answer

2-butene (more substituted alkene)

Question 12

What is the major product when 2-methyl-2-butene reacts with HBr?

Accepted Answer

2-bromo-2-methylbutane

Question 13

Which IR absorption is characteristic of an O-H stretch in alcohols?

Accepted Answer

$$\sim 3300\ 	ext{cm}^{-1} ($$broad)

Question 14

A compound with molecular formula $$C_5H_{10}Br_2$ is found to have two degrees of unsaturation. Which structure is most consistent with this information?

Accepted Answer

A cyclopentene ring with two bromines attached.

Question 15

Which of the following best describes the difference between regiospecificity and regioselectivity?

Accepted Answer

Regiospecificity means a reaction produces only one regioisomer, while regioselectivity means one isomer is favored but others are also formed.

Question 16

Which of the following statements about bond order and bond length is correct?

Accepted Answer

A double bond is stronger and shorter than a single bond.

Question 17

Which of the following is true about the chair conformation of cyclohexane?

Accepted Answer

Substituents in the equatorial position experience less steric strain than those in the axial position.

Question 18

Which splitting pattern would you expect for a methyl group ($$	ext{CH}_3) $$adjacent to a methylene group ($$	ext{CH}_2) in a$$ $$^1H $$NMR spectrum?

Accepted Answer

Triplet

Question 19

Which of the following best explains why tert-butyl chloride reacts faster than methyl chloride in an SN1 reaction?

Accepted Answer

Tert-butyl chloride forms a more stable carbocation intermediate.

Question 20

Which of the following is the correct formula for calculating degrees of unsaturation for a molecule containing C, H, N, and halogens?

Accepted Answer

$$\frac{2C + 2 + N - H - X}{2}$$

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