Which one of the following compounds would exhibit seven signals in its 13C NMR spectrum?

Which of the following conjugated dienes represent two conformations?

Which of the following indicated C—C bonds is(are) the shortest?

How many π-bonding molecular orbitals does 1,3-pentadiene have?

Which of the following indicated C—C bonds is (are) the longest?

Provide a stepwise synthesis for the following.      he answer should be entered as in the following example: (this is an example!) 1. NaNH2   2. CH3CH2Br   3. H2, Lindlar’s Cat.    4. BH3, THF   5. H2O2, NaOH                          (Keep three spaces between each step) All chemicals and reagents  structures should be correct and with the proper sequence. No partial credit.

Which of the following is antiaromatic?

What is the structure of a compound of molecular formula C10H14O2 that shows a strong IR absorption at 3150 and 2850 cm-1 and gives the following 1H NMR absorptions: 1.4 (triplet, 6H); 4.0 (quartet, 4H); and 6.8 (multiplet, 4H) ppm?

Identify the cumulated diene.

What is the structure for 4-amino-2-bromophenol?