Why is the compound shown not considered aromatic ev though it has 3 double bonds in conjugation and a 6- membered ring? I.Ilt is not planar II.It does not contain 4n+2 pi electrons III.It does not have a continuous cyclic system of pi orbita A) Ionly B) I and III III only

Draw an 8 membered ring that is aromatic and draw the molecular orbital diagram derived from frosts circle

12. The compound below contains A) 4 spº hybridized carbons; 2 sp² hybridized carbons and 2 sp hybridized carbons 2 sp3 hybridized carbons; 4 sp² hybridized carbons and 2 sp hybridized carbons B) C) 1 sp3 hybridized carbon; 5 sp? hybridized carbons and 2 sp hybridized carbons D) 4 sp³ hybridized carbons and 4 sp? hybridized carbons 13. Which of the following species is not a Brønsted-Lowry base? A) NH3 B) BF3 C) H2O D) PO43-

A. B. C. Me CH3 ClC H ¿ OH NH₂ H Br-C-C H3C H Br CH3 Comparing structure pair in B OH Comparing structure pair in C [Select] Me HC CI Comparing structure pair in A [Select] [Select] Same structure drawn differently Enantiomers Diastereomers NH₂ Br H3C CH3 Br HC-CCH3 H For the following two structures compared in parts A and B, determine whether they are enantiomers OR diastereomers OR the same structure drawn differently (non-bonding electrons not included for clarity).

AZT was the first drug approved to treat HIV, the virus that causes AIDS. Explain why the sixmembered ring of AZT is aromatic.

Compound 1 Br Bri НІ T ... H The correct IUPAC names are: Compound 2 H Br Br I.. H Br The compounds are diastereomers not isomeric enantiomers identical constitutional isomers Compound 1: (2R, 3R)-1,2,3-tribromobutane, Compound 2: (2S, 3R)-1,2,3-tribromobutane Compound 1: (2R, 3S)-1,2,3-tribromobutane, O Compound 1: (2R,3R)-1,2,3-tribromobutane, Compound 2: (2S,3S)-1,2,3-tribromobutane Compound 2: (2R, 3R)-1,2,3-tribromobutane O Compound 1: (2S,3S)-1,2,3-tribromobutane, Compound 2: (2R,3S)-1,2,3-tribromobutane

6. Consider each compound below. Note the number of T electrons in the ring in each compound and indicate if it is aromatic or not aromatic (assume planarity for all molecules). B. TT electrons TT electrons TT electrons Aromatic? Aromatic? Aromatic?

None

Which compounds are aromatic? (A) (B) (C) (D) (E) (F) В (G) (H) (1)

AZT was the rst drug approved to treat HIV, the virus that causes AIDS. Explain why the sixmembered ring of AZT is aromatic.