How many signals would you expect in the ¹H-NMR spectrum of the following aromatic compound?

Consider the following molecule:

Which of the following represents one correctly drawn resonance structure for the molecule?

Consider the following pair of molecules. What is the relationship between them?

Select from the drop-down list the functional group present in each of the molecules drawn below.

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Which electronic configuration for p-orbitals obeys all the rules ( Pauli Exclusion Principle; Hund's Rule and Aufbau Principle)?

What is the condensed electronic configuration for Fe(0) in the gas phase?

Which first row transition metal has only two possible oxidation states?