Textbook Question
For each of the following compounds and ions,
1. Draw a Lewis structure.
2. Show the kinds of orbitals that overlap to form each bond.
3. Give approximate bond angles around each atom except hydrogen
h.
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1. A Review of General Chemistry
Lewis Structure
Multiple Choice
Which of the following best describes the correct Lewis structure for (allene)?
A
The central carbon atom forms a triple bond with one terminal carbon and a single bond with the other terminal carbon; each terminal carbon is bonded to two hydrogens.
B
All three carbon atoms are connected by single bonds, and each carbon is bonded to two hydrogens.
C
The central carbon atom forms two double bonds, one with each terminal carbon, and each terminal carbon is bonded to two hydrogens.
D
The central carbon atom forms a single bond with each terminal carbon, and each terminal carbon is bonded to three hydrogens.
Verified step by step guidance1
Identify the molecular formula and structure of allene, which is \( \mathrm{H_2C=C=CH_2} \), consisting of three carbon atoms in a row with hydrogens attached to the terminal carbons.
Recall that in allene, the central carbon atom is connected to the two terminal carbons by double bonds, not single or triple bonds, because it has two double bonds arranged linearly.
Understand that each terminal carbon in allene is bonded to two hydrogen atoms, completing their four bonds (two to hydrogens and two to the central carbon via a double bond).
Recognize that the central carbon has no hydrogens attached and forms exactly two double bonds, one with each terminal carbon, which explains the linear arrangement of the carbon atoms.
Conclude that the correct Lewis structure for allene shows the central carbon atom forming two double bonds (one to each terminal carbon), and each terminal carbon bonded to two hydrogens, matching the description of the correct answer.
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