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Practice Questions (PQ) PQ-1. How many stereocenters are present in this molecule? (A) 1 PQ-2. Which of the numbered carbons in this compound are stereocenters? (B) 2 (A) I(S) and II(S) (A) 1, 2, and 3 (B) 1 and 3 (C) 2 only PQ-3. What are the absolute configurations of these two molecules? SH (C) 3 H₂CH₂CcO₂H H3C I (B) I(S) and II(R) CH₂Br H+OCH 3 CH₂CH3 II (C) I(R) and II(S) Br (D) 4 OCH 3 OCH 3 (D) 2 and 3 (D) I(R) and II(R)

Practice Questions (PQ) PQ-1. How many stereocenters are present in this molecule? (A) 1 PQ-2. Which of the numbered carbons in this compound are stereocenters? (B) 2 (A) I(S) and II(S) (A) 1, 2, and 3 (B) 1 and 3 (C) 2 only PQ-3. What are the absolute configurations of these two molecules? SH (C) 3 H₂CH₂CcO₂H H3C I (B) I(S) and II(R) CH₂Br H+OCH 3 CH₂CH3 II (C) I(R) and II(S) Br (D) 4 OCH 3 OCH 3 (D) 2 and 3 (D) I(R) and II(R)

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Practice Questions (PQ) PQ-1. How many stereocenters are present in this molecule? (A) 1 (B) 2 PQ-2. Which of the numbered carbons in this compound are stereocenters? (A) I(S) and II(S) (A) 1, 2, and 3 (B) 1 and 3 (C) 2 only PQ-3. What are the absolute configurations of these two molecules? SH H₂CH₂C₁ H₂C I CO₂H (B) I(S) and II(R) (C) 3 48 2 CH₂Br H+OCH3 CH₂CH3 II (C) I(R) and II(S) 3 Br (D) 4 OCH 3 OCH 3 (D) 2 and 3 (D) I(R) and II(R)
Transcribed Image Text:Practice Questions (PQ) PQ-1. How many stereocenters are present in this molecule? (A) 1 (B) 2 PQ-2. Which of the numbered carbons in this compound are stereocenters? (A) I(S) and II(S) (A) 1, 2, and 3 (B) 1 and 3 (C) 2 only PQ-3. What are the absolute configurations of these two molecules? SH H₂CH₂C₁ H₂C I CO₂H (B) I(S) and II(R) (C) 3 48 2 CH₂Br H+OCH3 CH₂CH3 II (C) I(R) and II(S) 3 Br (D) 4 OCH 3 OCH 3 (D) 2 and 3 (D) I(R) and II(R)
PQ-4. Which molecule has the (R) configuration? OH CH₂OH (A) H OHC (A) (A) CH₂ HT Br H H₂C PQ-5. What is the molecular formula for an unsubstituted alkane of smallest molar mass which possesses a stereogenic center? (A) CsH12 H₂C (B) C6H14 (C) C₂H16 (D) C8H18 PQ-6. Which Newman projection best depicts a gauche interaction between two bromine atoms? Br BrH Br Br H. Br H. H H H (B) H H CH₂CH3 H (B) HO (A) 2R, 3R (B) H. (A) (S)-1,2-dihydroxypropanal (C) (S)-2,3-dihydroxypropanal CO₂H H Br H3C. H PQ-7. Which Newman projection represents the most stable conformation of 3-methylpentane when viewed down the 2-3 carbon-carbon bond? H CH3 H H H PQ-8. Rank these conformations from least to most stable. (A) I<II<III (B) III <II<I PQ-9. What is the name for this compound? CH₂CH3 H (B) 2R, 3S (C) H3C₁ HO₂C PQ-10. What are the configurations of the two stereocenters in this Fischer projection? (C) (C) H3C H H CH₂OH OH H. 'Н H3CH H H (C) 2S, 3R CH₂CH3 CH3 CH3 OH (1) HCH₂ NC H I (C) II < III <I (D) H (D) H CH3 H. CH3 H. H8 H H II H H3C. H OH H-OH H H3C CHO OH H- 2 H 3 OH CH₂OH I H (B) (R)-2,3-dihydroxypropanal (D) (2R,3R)-2,3-dihydroxypropanal H H III (D) II<I<III (D) 2S, 3S Br CH3 @ CH3 H H H CH₂CH3 CH3
Transcribed Image Text:PQ-4. Which molecule has the (R) configuration? OH CH₂OH (A) H OHC (A) (A) CH₂ HT Br H H₂C PQ-5. What is the molecular formula for an unsubstituted alkane of smallest molar mass which possesses a stereogenic center? (A) CsH12 H₂C (B) C6H14 (C) C₂H16 (D) C8H18 PQ-6. Which Newman projection best depicts a gauche interaction between two bromine atoms? Br BrH Br Br H. Br H. H H H (B) H H CH₂CH3 H (B) HO (A) 2R, 3R (B) H. (A) (S)-1,2-dihydroxypropanal (C) (S)-2,3-dihydroxypropanal CO₂H H Br H3C. H PQ-7. Which Newman projection represents the most stable conformation of 3-methylpentane when viewed down the 2-3 carbon-carbon bond? H CH3 H H H PQ-8. Rank these conformations from least to most stable. (A) I<II<III (B) III <II<I PQ-9. What is the name for this compound? CH₂CH3 H (B) 2R, 3S (C) H3C₁ HO₂C PQ-10. What are the configurations of the two stereocenters in this Fischer projection? (C) (C) H3C H H CH₂OH OH H. 'Н H3CH H H (C) 2S, 3R CH₂CH3 CH3 CH3 OH (1) HCH₂ NC H I (C) II < III <I (D) H (D) H CH3 H. CH3 H. H8 H H II H H3C. H OH H-OH H H3C CHO OH H- 2 H 3 OH CH₂OH I H (B) (R)-2,3-dihydroxypropanal (D) (2R,3R)-2,3-dihydroxypropanal H H III (D) II<I<III (D) 2S, 3S Br CH3 @ CH3 H H H CH₂CH3 CH3
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