PQ-4. Which molecule has the (R) configuration? ОН CH₂OH со н (A) H ОНС CH3 (В) Н НО (C) H3C но с CH2OH ОН (D) H NC ОН CH3

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Chapter1: Chemical Foundations
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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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