You may have drawn an incorrect resonance structure OR a minor resonance contributor. Remember, in a resonance structure, pi electrons and non-bonding electrons can be drawn on other atoms of the conjugated system. All sigma bonds must stay the same. A major resonance contributor will attempt to minimize charge separation and provide all atoms with complete octets. Reconsider the starting structure to evaluate which electrons can be drawn in a different position. Re-evaluate which structure will be the major contributor.
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
I don't understand what it means to adjust the pi bond. Shouldn't it always be on the oxygen?
Thank you!!
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