Organic Chemistry Help!!! 1. A reaction which produces two or more stereiosomers

Question

Organic Chemistry Help!!!

1. A reaction which produces two or more stereiosomers but yields mainly one of them is referred to as?

A. Enatiomer selectivity

B. Regioselective

C. Structural isomerism

D. Stereoselective

2. Assume you only used half the amount of bromine solution given in the procedure, how might this affect your results?

A. Since we are using a 100% excess of bromine in for the reaction, yield will not be affected

B. Since this is an equilibrium reaction, yield is increased

C. The yield is reduced by about half and the product will contain a combination of both unreacted trans-cinnamic acid and the dibromide

D. This will not affect the yield but the reaction will proceed at half the rate

3. Which structure below is that of a brominium ion?

A. Br- bonded to an oxygen

B. Br2

C. Br bonded to two carbons

D. Br-Br+ bonded to two carbons

4. Why is the reaction being conducted at 50 degrees C?

A. To prevent trans-cinnamic acid from reverting to the cis form

B. To increase the rate of reaction

C. To prevent the glacial acetic acid from solidifying

D. To avoid the loss of bromine by vaporization

5. In the anti addition of bromine to cyclopentene,

A. The more positively charged bromine atom is attracted to the pi cloud of the double bond

B. The more negatively charged bromine atom is attracted to the sigma cloud of the double bond

C. One of the carbons of the double bond becomes a carbocation and is attacked by both bromine atoms.

D. Each bromine atom becomes positively charged and attaches to the same carbon of the double bond

6. The erythro form of the product will contain which of the following enantiomers?

A. 2R, 3S

B. 2R, 3R

C. 1S, 4R

D. 2S, 3S

7. Name the following compound. (use the trans/cis or erythro/threo nomenclature when appropriate)

Organic Chemistry Help!!! 1. A reaction which produces two or more stereiosomers but yields mainly one of them is referred to as? A. Enatiomer selectivity B. Regioselective C. Structural isomerism D. Stereoselective 2. Assume you only used half the amount of bromine solution given in the procedure, how might this affect your results? A. Since we are using a 100% excess of bromine in for the reaction, yield will not be affected B. Since this is an equilibrium reaction, yield is increased C. The yield is reduced by about half and the product will contain a combination of both unreacted trans-cinnamic acid and the dibromide D. This will not affect the yield but the reaction will proceed at half the rate 3. Which structure below is that of a brominium ion? A. Br- bonded to an oxygen B. Br2 C. Br bonded to two carbons D. Br-Br+ bonded to two carbons 4. Why is the reaction being conducted at 50 degrees C? A. To prevent trans-cinnamic acid from reverting to the cis form B. To increase the rate of reaction C. To prevent the glacial acetic acid from solidifying D. To avoid the loss of bromine by vaporization 5. In the anti addition of bromine to cyclopentene, A. The more positively charged bromine atom is attracted to the pi cloud of the double bond B. The more negatively charged bromine atom is attracted to the sigma cloud of the double bond C. One of the carbons of the double bond becomes a carbocation and is attacked by both bromine atoms. D. Each bromine atom becomes positively charged and attaches to the same carbon of the double bond 6. The erythro form of the product will contain which of the following enantiomers? A. 2R, 3S B. 2R, 3R C. 1S, 4R D. 2S, 3S 7. Name the following compound. (use the trans/cis or erythro/threo nomenclature when appropriate)

Explanation / Answer

Hi,

1)B. Regioselective

2)C. The yield is reduced by about half and the product will contain a combination of both unreacted trans-cinnamic acid and the dibromide

3)C. Br bonded to two carbons

4)A. To prevent trans-cinnamic acid from reverting to the cis form

5)C. One of the carbons of the double bond becomes a carbocation and is attacked by both bromine atoms.

6)B. 2R, 3R

7)(2S,3R)-2,3-dibromo-3-phenylpropanoic acid

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