Question 1

Which of the following best explains why methane ($$\mathrm{CH_4$}) $$adopts a tetrahedral geometry according to VSEPR theory?

Accepted Answer

The four hydrogen atoms repel each other equally, maximizing their distance.

Question 2

Which of the following molecules violates the octet rule?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 3

What is the formal charge on the oxygen atom in the carbonate ion ($$\mathrm{CO_3$^{2-}}) if it is $$drawn with one double bond and two single bonds?

Accepted Answer

Each singly bonded oxygen has a formal charge of $$-1.$$

Question 4

Which of the following best describes the bonding in benzene ($$\mathrm{C_6H_6}$$)?

Accepted Answer

Delocalized $$\pi$$ electrons above and below the plane of the ring

Question 5

Which of the following statements about resonance is correct?

Accepted Answer

Resonance structures differ only in the arrangement of electrons, not atoms.

Question 6

Which of the following is the best example of a molecule stabilized by hyperconjugation?

Accepted Answer

Tert-butyl carbocation ($$\mathrm{(CH_3$)_3C^+})$$

Question 7

Which of the following best explains why cyclopropane is less stable than cyclohexane?

Accepted Answer

Cyclopropane has significant ring strain due to bond angles of $$60^\circ.$$

Question 8

Which of the following is NOT a criterion for aromaticity according to Hückel's rule?

Accepted Answer

The molecule must have an even number of carbon atoms.

Question 9

Which of the following best describes the inductive effect?

Accepted Answer

The transmission of charge through a chain of atoms in a molecule by electrostatic induction

Question 10

Which of the following carbocations is most likely to undergo rearrangement?

Accepted Answer

A secondary carbocation adjacent to a tertiary carbon

Question 11

Which of the following is the correct order of basicity for the following species: $$\mathrm{NH_3$}$$, $$\mathrm{C_2H_5NH_2}$$, $$\mathrm{(C_2H_5)_2NH}$$?

Accepted Answer

$$\mathrm{(C_2H_5)_2NH} \u003e \mathrm{C_2H_5NH_2} \u003e \mathrm{NH_3$}$$

Question 12

Which of the following best describes a carbanion?

Accepted Answer

A species with a negatively charged carbon atom

Question 13

Which of the following is a correct statement about optical isomerism?

Accepted Answer

Optical isomers rotate plane-polarized light in opposite directions.

Question 14

Which of the following best explains why the chair conformation of cyclohexane is more stable than the boat conformation?

Accepted Answer

The chair conformation minimizes both torsional and steric strain.

Question 15

Which of the following is a real-life application of resonance stabilization?

Accepted Answer

The stability of the acetate ion in acetic acid

Question 16

Which of the following best describes a free radical?

Accepted Answer

A species with an unpaired electron

Question 17

Which of the following is a correct statement about tautomerism?

Accepted Answer

Tautomers are isomers that interconvert by the movement of a proton and a double bond.

Question 18

Which of the following is a real-world example of a regioselective reaction?

Accepted Answer

The addition of $$\mathrm{HBr} to $$propene, forming 2-bromopropane as the major product

Question 19

Which of the following best describes the ortho effect in substituted benzoic acids?

Accepted Answer

Ortho-substituted benzoic acids are less acidic due to steric hindrance.

General Organic Chemistry: Foundations, Structure, and Stereochemistry

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