Is the following structure aromatic, antiaromatic or nonaromatic?  Assume it is planar. 

________ is used as a reference for recording NMR spectra and is assigned a chemical shift value of zero.

A compound, with molecular formula C4H9Br, displays the 1H NMR spectrum shown and 13C NMR spectra. Propose a structure for this compound.

Which one of the following molecular orbitals of 1,3-butadiene has the most nodes? 

How many nuclear spin states are possible for the 1H nucleus?

Which of the compounds shown gives a 1H NMR spectrum consisting of only a singlet?

How many signals would you expect in the 1H NMR spectrum of the compound given?

08)  a) (6 points) Evaluate

Propose a structure for a compound, with molecular formula C8H14O3, that fits the following spectroscopic data:IR: 1820cm-1, 1760cm-11H NMR: 1.0 δ (triplet, 6H), 1.6 δ (sextet, 4H), 2.2 δ (triplet, 4H)

A compound with a molecular formula of C5H10O has the 1H NMR spectrum shown. Which structure shown is consistent with this spectrum?