Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

General Chemistry

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

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Multiple Choice

Which of the following best describes the correct Lewis dot structure for the neutral compound C3H4O (propenal)?

A linear chain with all single bonds between carbons, an oxygen atom bonded to the central carbon, and all hydrogens attached to terminal carbons.

A three-carbon chain with a terminal aldehyde group (–CHO), one double bond between C1 and C2, and all atoms obeying the octet rule.

A branched structure with the oxygen atom bonded to a methyl group and all carbons connected by single bonds.

A three-carbon ring with an oxygen atom double-bonded to one carbon and all hydrogens attached to the same carbon.

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Verified step by step guidance

Identify the molecular formula C3H4O and recognize that the compound is propenal, an aldehyde with a three-carbon chain and a double bond.

Recall that an aldehyde group (–CHO) consists of a carbon double-bonded to oxygen and single-bonded to hydrogen at the end of the carbon chain.

Determine the placement of the double bond between the first and second carbon atoms (C1 and C2) to satisfy the structure of propenal, ensuring the molecule is linear and not branched or cyclic.

Apply the octet rule to each atom: carbon atoms should have four bonds total, oxygen should have two bonds and two lone pairs, and hydrogen atoms should have one bond each.

Verify that all hydrogens are attached to carbons in a way that satisfies valence requirements, with no hydrogens bonded directly to oxygen, and confirm the overall structure matches the description of a three-carbon chain with a terminal aldehyde group and a double bond between C1 and C2.