Question 1

Which of the following statements about the hybridization and geometry of the carbon atoms in benzene (C₆H₆) is correct?

Accepted Answer

Each carbon is sp² hybridized and the molecule is planar.

Question 2

A student is given a sample of an unknown organic compound and runs a thin layer chromatography (TLC) using silica gel as the stationary phase. The compound travels 1.5 cm while the solvent front travels 6.0 cm. What is the Rf value for this compound?

Accepted Answer

$$Rf = \frac{1.5}{6.0} = 0.25$$

Question 3

Which of the following best explains why water (H₂O) is a polar molecule, while carbon dioxide (CO₂) is nonpolar, even though both have polar bonds?

Accepted Answer

The molecular shape of H₂O is bent, so the bond dipoles do not cancel, while CO₂ is linear and the dipoles cancel.

Question 4

Which of the following is the correct electron configuration for a neutral carbon atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 5

A compound has the molecular formula C₅H₁₂. Which of the following best describes this compound?

Accepted Answer

It is an acyclic alkane.

Question 6

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

Accepted Answer

A secondary alcohol is oxidized to a ketone.

Question 7

During a simple distillation, why is it important that the cooling water enters the condenser at the bottom and exits at the top?

Accepted Answer

To ensure the condenser fills completely with water for efficient cooling.

Question 8

Which of the following best describes the difference between sigma (σ) and pi (π) bonds in organic molecules?

Accepted Answer

A sigma bond is stronger and forms the first bond between two atoms; pi bonds are weaker and form only after a sigma bond is present.

Question 9

A student is asked to identify the limiting reactant in a reaction. Which of the following is the correct sequence of steps to determine the limiting reactant?

Accepted Answer

Balance the equation, convert reactants to moles, use mole ratios to calculate possible product from each reactant, and identify the reactant that produces the least product.

Question 10

Which of the following functional groups is present in both acetylferrocene and camphor?

Accepted Answer

Ketone

Question 11

Which of the following statements about intermolecular forces is correct?

Accepted Answer

Hydrogen bonding occurs when hydrogen is bonded to O, N, or F and interacts with a lone pair on another electronegative atom.

Question 12

A student is purifying a solid by recrystallization. Which of the following best describes the ideal solvent for recrystallization?

Accepted Answer

The compound should dissolve well in hot solvent but poorly in cold solvent.

Question 13

Which of the following is the correct formula for a cyclohexane molecule?

Accepted Answer

$$C_6H_{12}$$

Question 14

Which of the following statements about the combustion of alkanes is correct?

Accepted Answer

Combustion of an alkane produces carbon dioxide and water.

Question 15

Which of the following best describes the product of the hydration of an alkene?

Accepted Answer

An alcohol

Question 16

A student is analyzing a mixture using column chromatography with silica as the stationary phase. Which compound will elute (come out) first?

Accepted Answer

The least polar compound

Question 17

Which of the following is a correct statement about the structure of ethers?

Accepted Answer

Ethers have an oxygen atom bonded to two carbon atoms.

Question 18

Which of the following is the correct percent yield if the theoretical yield is 5.0 g and the actual yield is 3.5 g?

Accepted Answer

$$\%\ yield = \frac{3.5}{5.0} 	imes 100 = 70\%$$

Question 19

Which of the following best describes the role of a drying agent such as MgSO₄ in an organic laboratory procedure?

Accepted Answer

It removes small amounts of water from an organic liquid.

Organic Chemistry Exam 1 Study Guide: Foundations, Structure, Nomenclature, and Laboratory Concepts

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