Identify the relationship between the following two structures. A. Enantiomers B
ID: 527085 • Letter: I
Question
Identify the relationship between the following two structures. A. Enantiomers B. Identical C. Neither Which of the following is the correct structure for the compound (R)-2-pentanol? What is the percentage of the R enantiomer in a sample of carvone that has a specific rotation of +30, given that the specific (R)-carvone is -61? A. 26% B. 51% C. 49% D. 75% Which of the following is a substitution reaction? What is the nucleophile in the following reaction? What is the electrophile in the following reaction? Which of the following is the correct IUPAC name of the following structure? A. (S) 2-Bromo-4, 5-dimethylheptance B. (R) 2-Bromo-4, 5-dimethyl C. 3, 4-Dimethyl-6-bromoheptane D. 2-Bromo-4-methylhexane Which of the following is the correct structure for a compound with the IUPAC name of (R)-2-fluorobutane? Which of the following shows the correct arrow for loss of a bromide leaving group? Which of the following is the rate law for the following S_N 1 reaction? A. Rate k[tert-Butyl bromide] B. Rate k[HOCH_3] C. Rate k[HOCH_3] tert-Butyl bromide] D. Rate = k[HOCH3]^3Explanation / Answer
35.
The given two structures are identical except orientation of hydroxyl (OH) group in space. Thus, these are stereoisomers and they are not identical. These stereoisomers are mirror image of each other as hydroxyl group is one isomer is out of the plane of paper and that in another is inside the plane of paper. The stereoisomers which are mirror images of each other are called as enantiomers.
Therefore, given compounds are enantiomers. Thus, correct answer is option A. Enantiomers
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36.
Structure A is cyclopentanol. Structure D is hexanol as it has six carbon atoms in the molecule. Structure B and C are 2-pentanol. The absolute stereochemistry can be assigned by giving priorities to substitutents attached to carbon having hydroxy group. Hydroxy group gets first priority (1), propyl chain gets second priority(2) and smaller methyl group gets third priority(3). Connects three groups in sequence by keeping hydrogen backward.
Structure B has sequence(1-2-3) in anticlockwise direction and hydrogen is backward. Thus, its absolute configuration is S.
Structure C has sequence (1-2-3) in cloclwise direction by keeping hydrogen backward. Thus, its absolute configuration is R.
Therefore, correct answer is option C.
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38.
Substitution reaction involves displacement of one group by another. Reaction A invovles protonation to remove negative charge, hence it is not subsitution reaction. Reaction C involves addition of hydrogen, hence it is a addition reaction. Reaction D involves addition of oxygen atom across double bond, hence it is not substitution reaction.
Reaction B involves replacement of chloro group by methoxy group. Thus, reaction B is a substitution reaction.
Therefore, correct answer is option B.
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39.
Given reaction is nucleophilic displacement reaction in which iodide is displaced by nucleophilic SH2. Therefore, nucleophile is SH2.
Thus, correct answer is option A.
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40.
In the given reaction nucleophilic SH2 attacks electrophilic carbon containing iodine. Thus, electrophile is isopropyl iodide B.
Therefore, correct answer is option B.
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41.
The absolute configuration of chiral carbon is (S). Thus, correct IUPAC name is (S)-2-bromo-4,5-dimethylheptane.
Therefore, correct answer is option A.
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42.
The absolute configuration of chiral carbon in structure B is R. Therefore, correct answer is option B.
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43.
For a leaving group, arrow starts from the middle of bond and moves outward indicating the group is leaving.
Therefore, correct answer is option A.
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44.
SN1 reaction is a first order reaction. Its rate depends on concentration of SM. Therefore, rate law for given reaction is Rate = k[tert-butyl bromide]
Thus, correct answer is option A.