Question 1

Which of the following statements best describes the two fundamental rules of organic chemistry?

Accepted Answer

Atoms form bonds to achieve noble gas configurations and electron movement is shown with curved arrows.

Question 2

Given the Lewis dot symbols, which correctly represents a neutral oxygen atom?

Accepted Answer

$$O$$ with 6 dots around it

Question 3

Which of the following correctly ranks the electronegativity of C, N, O, and Cl from lowest to highest?

Accepted Answer

$$C \u003c N \u003c O \u003c Cl$$

Question 4

What is the formal charge on the nitrogen atom in the ammonium ion ($$NH_4$$^+$$)?

Accepted Answer

$$+1$$

Question 5

Which hybridization and bond length combination is correct for a carbon-carbon triple bond?

Accepted Answer

sp hybridization, shortest bond length

Question 6

Which arrow-pushing pattern correctly represents the resonance between the two major resonance forms of the acetate ion ($$CH_3COO^-$$)?

Accepted Answer

A curved arrow from a lone pair on one oxygen to form a double bond with carbon, and a curved arrow from the double bond to the other oxygen.

Question 7

What is the predicted shape and hybridization of the central atom in formaldehyde ($$CH_2O$$)?

Accepted Answer

Trigonal planar, sp$$^2$$ hybridization

Question 8

How does resonance affect bond length in the carboxylate ion ($$COO^-$$)?

Accepted Answer

Both C–O bonds are equal and intermediate in length between a single and double bond.

Question 9

The 'resonance rhino' analogy is used to illustrate which concept?

Accepted Answer

The true structure is a hybrid of all resonance forms, not any single form.

Question 10

What is the correct IUPAC prefix for a 9-carbon alkane chain?

Accepted Answer

non-

Question 11

Rank the following intermolecular forces from weakest to strongest: London dispersion, hydrogen bonding, dipole-dipole.

Accepted Answer

London dispersion \u003c dipole-dipole \u003c hydrogen bonding

Question 12

A carbon atom bonded to three other carbons is classified as:

Accepted Answer

3° (tertiary)

Question 13

Which of the following is the correct common name for a $$C_4H_9$$ substituent?

Accepted Answer

butyl

Question 14

Which of the following is the correct Newman projection for the most stable conformation of ethane ($$C_2H_6$$)?

Accepted Answer

Staggered conformation with all H atoms as far apart as possible

Question 15

Which chair conformation of methylcyclohexane is lower in energy?

Accepted Answer

The one with the methyl group in the equatorial position

Question 16

Which of the following is the correct functional group for an aldehyde?

Accepted Answer

$$-CHO$$

Question 17

According to the Bronsted-Lowry definition, which of the following is a base?

Accepted Answer

A species that accepts a proton ($$H^+)$$

Question 18

In the reaction $$NH_3 + H_2O$$ \rightarrow $$NH_4^+ + OH$$^-$$, which is the conjugate acid?

Accepted Answer

$$NH_4$$^+$$

Question 19

Write the equilibrium constant expression for the reaction $$aA + bB \rightleftharpoons cC + dD.$$

Accepted Answer

$$K_{eq} = \frac{[C]^c [D]^d}{[A]^a [B]^b}$$

Question 20

Which of the following statements is true if $$K_{eq} \u003e 1$$ for a reaction?

Accepted Answer

Products are favored at equilibrium.

Question 21

Which factor increases acid strength by stabilizing the conjugate base through electron withdrawal?

Accepted Answer

Inductive effect

Organic Chemistry Exam Study Guide: Key Concepts and Practice Guidance

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