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CHEM 14C EXAM 1

CHEM 14C EXAM 1 - This is an information and scratch paper...

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This is an information and scratch paper page. Nothing on this page will be graded. It will be discarded prior to grading. You may carefully remove it from this exam if you wish. (+)-Abscisic acid is a hormone produced by plants when growth conditions are unfavorable. Its presence inhibits growth, conserves water, and in general tells the plant to ‘slow down.’ Pyrabactin is a synthetic product which mimics the action of (+)-abscisic acid, and as has been used in agriculture as a weed growth inhibitor. (+)-Abscisic acid Pyrabactin OH O CH 3 CH 3 OH O S O O N N Br H Pyridine ring
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Page 2 Page 2 score = 1. (2) Write the molecular formula of (+)-abscisic acid (i.e. C 4 H 60 ). 2. (4) Write the name(s) of all functional group(s) present in (+)-abscisic acid. 3. (4) Write a number in each blank: (+)-Abscisic acid has ___________ sp 2 atoms and ___________ lone pairs. 4. (8) Biological properties of molecules are often influenced by how much they ionize in aqueous solution. In the case of (+)-abscisic acid, this ionization is strongly influenced by resonance. (a) In boxes B and C draw two additional resonance contributors of structure A . ( means ‘molecule beyond this point not important.’) Less significant resonance contributors will earn less significant credit . Include all lone pairs and nonzero formal charges. A B C (b) In boxes E and F draw two additional resonance contributors of structure D . Less significant resonance contributors will earn less significant credit . Include all lone pairs and nonzero formal charges. D E F 5. (7) Consider the relative significance of resonance contributors D F of question 4(b). In each statement below write ‘is’ or ‘is not’ in each blank as appropriate to complete each statement. If you write ‘is not’ complete the
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