The most commonly used diagnostic tool for tuberculosis is a simple skin test, though blood tests are becoming more commonplace. A small amount of a substance called PPD tuberculin is injected just below the skin of your inside forearm. You should feel only a slight needle prick.
The structure has a double bond and an adjacent atom with a lone pair, so it could have resonance. The possible resonance structures are below. The first structure has the most common bonding pattern for all of its atoms, so it is a reasonable Lewis structure.
The Lewis structure is used to give a two-dimensional representation of covalent molecules and ions. Lewis structures are based on using dots and lines to represent bonding and non-bonding valence electrons. Lines are used to represent bonding pairs of electrons. Dots are used to signify electrons. Lewis structures may also be used to show valence