In an IR spectrum, a strong, narrow signal at 3300 cm-1 most likely corresponds to which of the following?
1) A structure shows a carbon atom with two bonds to R groups and a double bond to an oxygen atom.
2) A structure shows a carbon atom with a triple bond to a nitrogen atom and an open single bond.
3) A structure shows an oxygen atom with an open single bond and a single bond to a hydrogen atom.
4) A structure shows a carbon atom with an open single bond, a double bond to an oxygen atom, and a bond to a hydrogen atom.
5) A structure shows a carbon atom with an open single bond, an open double bond, and a bond to a hydrogen atom.
6) A structure shows a carbon atom with an open bond, a double bond to an oxygen atom, and a bond to an oxygen bonded to a hydrogen atom.
7) A structure shows a carbon atom with an open triple bond and a single bond to a hydrogen atom.
8) A structure shows a carbon atom with three open bonds and a bond to a hydrogen atom.
9) A structure shows two carbon atoms