Canonical Structures and Resonance
The following Lewis / Kekulé structures A through L are isomeric (molecular formula CN2H2). The first part of this question requires you to locate formal charges and electron deficient atoms (atoms that have not achieved a valence shell electron octet through covalent sharing).
This script written by William Reusch, Dept. of Chemistry, Michigan State University. Please send comments and corrections to firstname.lastname@example.org.
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