Chapter 15: Q 15-15-18 E-b (page 477)
Give IUPAC names for the following compounds
b)

Short Answer
b)

3-bromobenzoic acid
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Chapter 15: Q 15-15-18 E-b (page 477)
Give IUPAC names for the following compounds
b)

b)

3-bromobenzoic acid
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The following molecular model is that of a carbocation. Draw two resonance structures for the carbocation, indicating the positions of the double bonds.

Propose structures for aromatic hydrocarbons that meet the following descriptions:
(a) C9H12; gives only one C9H11Brproduct on substitution of hydrogen on the aromatic ring with bromine
(b)C10 H14; gives only one C10H13Clproduct on substitution of hydrogen on the aromatic ring with chlorine
(c) C8H10; gives three C8H9Brproducts on substitution of hydrogen on the aromatic ring with bromine
(d)C10 H14 ; gives two C10H13Clproducts on substitution of hydrogen on the aromatic ring with chlorine
Cyclopropane is highly reactive because of its large amount of angle strain. Methylcyclopropenone, although even more strained than cyclopropanone, is nevertheless quite stable and can even be distilled. Explain, taking the polarity of the carbonyl group into account.

Cyclopropanone Methylcyclopropenone
Draw an energy diagram for the three molecular orbitals of the cyclopropenyl system(C3H3). How are these three molecular orbitals occupied in the cyclopropenyl anion, cation, and radical? Which of the three substances is aromatic according to Hückel’s rule?
Bextra, a COX-2 inhibitor once used in the treatment of arthritis, contains an isoxazole ring. Why is the ring aromatic?
Bextra
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