Multiple Choice
Which of the following best describes the correct Lewis structure for (allene)?
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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 (NCNH)?
A
The central carbon atom is single-bonded to both nitrogen atoms, and each nitrogen atom is bonded to one hydrogen.
B
The central carbon atom is triple-bonded to one nitrogen atom, single-bonded to the other nitrogen atom, and the terminal nitrogen atom is bonded to two hydrogens.
C
The central carbon atom is triple-bonded to both nitrogen atoms, and the terminal nitrogen atom is not bonded to any hydrogens.
D
The central carbon atom is double-bonded to both nitrogen atoms, and the terminal nitrogen atom is bonded to two hydrogens.
Verified step by step guidance1
Identify the molecular formula and the connectivity: NCNH₂ suggests a chain of nitrogen-carbon-nitrogen with two hydrogens attached to one nitrogen atom.
Determine the total number of valence electrons: Nitrogen has 5 valence electrons, carbon has 4, and hydrogen has 1. Calculate the sum for all atoms in the molecule.
Consider the bonding preferences and typical bonding patterns: Carbon usually forms 4 bonds, nitrogen typically forms 3 bonds and may have a lone pair, and hydrogen forms 1 bond.
Evaluate possible bonding arrangements between the atoms, focusing on satisfying the octet rule for carbon and nitrogen atoms, and ensuring hydrogens have only one bond each.
Compare the options by checking which structure allows the central carbon to have a full octet, one nitrogen to be triple-bonded to carbon, the other nitrogen to be single-bonded to carbon and bonded to two hydrogens, consistent with the total valence electrons and bonding rules.
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