Final answer:
Lewis structures for N-methylidenehydroxylamine, methylamine, and acetonitrile involve depicting valence electrons and covalent bonds to respect the octet rule with attention to lone pairs on electronegative atoms like nitrogen and oxygen.
Step-by-step explanation:
Drawing Lewis structures for organic molecules such as N-methylidenehydroxylamine (CH₂NOH), methylamine (CH₃NH₂), and acetonitrile (CH₃CN) is essential to understand their chemical reactivity and physical properties. For N-methylidenehydroxylamine, the central carbon atom is double-bonded to nitrogen and singly bonded to an OH group and two hydrogens. Methylamine has a central nitrogen single-bonded to three hydrogens and a methyl group. In acetonitrile, the central carbon is triple-bonded to nitrogen and single-bonded to a methyl group. All these structures adhere to the octet rule, with atoms completing their valence shells to achieve a stable configuration.
Remember that in drawing Lewis structures, electrons are represented as dots, and lines represent covalent bonds between atoms. Lone pairs on atoms like nitrogen and oxygen should be depicted to correctly illustrate the molecule's valence electrons. Determining the correct Lewis structure is also the first step in predicting molecular geometry, hybridization, and polarity, furthering our understanding of the molecule's chemistry.