Organic Chemistry

1. State true or false

a) Monochromatic light is light consisting of one orientation

b) A substance is said to be racemic when it has exactly 50% of dextro- and levorotatory

enantiomers

c) A polarimeter uses Nicol prism to generate plane-polarized light

2. What is the purpose of a resolving agent? What resolving agent is used in today’s

experiment?

3. The tartrate salt of the (-)-amine crystallizes as ……………… and that of (+)-amine crystallizes as ………………

4. List few factors which affect the extent of optical rotation

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5. Define optical purity

6. If a substance has 40% enantiomeric excess of the dextrorotatory enantiomer, what

percent of the mixture is the levorotatory enantiomer?

7. If we observe an optical rotation of -23.6o for a solution of concentration 0.7 g/mL in a

sample tube of length 0.5 dm, what is the specific rotation of the sample?