Question 1

Which of the following is the correct Lewis structure for carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O, with each oxygen atom having two lone pairs

Question 2

Given the molecule $$\mathrm{CH_3OH} ($$methanol), what is the total number of valence electrons?

Accepted Answer

$$14$$

Question 3

Which of the following best describes the formal charge on the nitrogen atom in ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

$$0$$

Question 4

Which bond is the most polar based on electronegativity differences?

Accepted Answer

$\mathrm{O-H}$$

Question 5

Rank the following molecules in order of increasing boiling point: $$\mathrm{CH_4$}$$, $$\mathrm{CH_3Cl}$$, $$\mathrm{CH_3OH}.$$

Accepted Answer

$$\mathrm{CH_4$} \u003c \mathrm{CH_3Cl} \u003c \mathrm{CH_3OH}$$

Question 6

Which intermolecular force is primarily responsible for the high boiling point of water ($$\mathrm{H_2O}$$)?

Accepted Answer

Hydrogen bonding

Question 7

Which of the following molecules can exhibit hydrogen bonding?

Accepted Answer

$$\mathrm{CH_3NH_2}$$

Question 8

Which of the following is an example of an aromatic compound?

Accepted Answer

Benzene ($$\mathrm{C_6H_6})$$

Question 9

Which functional group is present in both acetone and formaldehyde?

Accepted Answer

Carbonyl group ($$\u003e\mathrm{C=O})$$

Question 10

Which of the following statements about resonance structures is correct?

Accepted Answer

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

Question 11

Which of the following molecules is most likely to undergo hydrogenation?

Accepted Answer

1-hexene ($$\mathrm{C_6H_{12}})$$

Question 12

Which of the following best describes the hybridization of the central carbon in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

$$sp^2$$

Question 13

Which of the following is the correct order of acidity (from most acidic to least acidic)?

Accepted Answer

Carboxylic acid $$\u003e$$ alcohol $$\u003e$$ alkane

Question 14

Which of the following is a correct statement about the relationship between bond length and bond strength?

Accepted Answer

Shorter bonds are generally stronger than longer bonds.

Question 15

Which of the following is the best resonance structure for the acetate ion ($$\mathrm{CH_3COO^-}$$)?

Accepted Answer

Both oxygen atoms share the negative charge equally, with one double bond and one single bond to carbon.

Question 16

Which of the following is NOT a valid resonance structure for the nitrate ion ($$\mathrm{NO_3$^-}$$)?

Accepted Answer

A structure with nitrogen having five bonds

Question 17

Which of the following best explains why $$\mathrm{HF}$$ has a higher boiling point than $$\mathrm{HCl}$$?

Accepted Answer

$$\mathrm{HF}$$ forms strong hydrogen bonds, while $$\mathrm{HCl}$$ does not.

Question 18

Which of the following is the correct IUPAC name for the compound with the structure $$\mathrm{CH_3CH_2COOH}$$?

Accepted Answer

Propanoic acid

Question 19

Which of the following statements about the relationship between molecular structure and boiling point is correct?

Accepted Answer

Molecules with stronger intermolecular forces have higher boiling points.

Organic Chemistry Exam 1 Study Guide: Foundational Concepts and Molecular Properties

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