Concept explainers
(a)
Interpretation:
The given molecule is chiral or not is to be identified.
Concept introduction:
The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.
Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.
(b)
Interpretation:
The given molecule is chiral or not is to be identified.
Concept introduction:
The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.
Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.
(c)
Interpretation:
The given molecule is chiral or not is to be identified.
Concept introduction:
The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.
Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.
(d)
Interpretation:
The given molecule is chiral or not is to be identified.
Concept introduction:
The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.
Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.
(e)
Interpretation:
The given molecule is chiral or not is to be identified.
Concept introduction:
The absence of chiral centers does not guarantee that a molecule is achiral. For a molecule to be chiral, it must not be superimposable on its mirror image. Allenes are the cumulated dienes in which one carbon atom is attached with each of its two neighbouring carbon atoms by double bonds. Disubstituted allenes are the ones in which the two hydrogen atoms on the same carbon or on adjacent carbon atoms are replaced by two non-hydrogen substituents.
Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.
Want to see the full answer?
Check out a sample textbook solution
Chapter 5 Solutions
Organic Chemistry: Principles And Mechanisms (second Edition)
- Can you please explain this problem to me and expand it so I can understand the full Lewis dot structure? Thanks!arrow_forwardCan you please explain this problem to me and expand it so I can understand the full Lewis dot structure? Thanks!arrow_forwardPlease answer the questions in the photos and please revise any wrong answers. Thank youarrow_forward
- (Please be sure that 7 carbons are available in the structure )Based on the 1H NMR, 13C NMR, DEPT 135 NMR and DEPT 90 NMR, provide a reasoning step and arrive at the final structure of an unknown organic compound containing 7 carbons. Dept 135 shows peak to be positive at 128.62 and 13.63 Dept 135 shows peak to be negative at 130.28, 64.32, 30.62 and 19.10.arrow_forward-lease help me answer the questions in the photo.arrow_forwardDefine electronegativity.arrow_forward
- Why do only the immediately adjacent H's show up in the number of peaks? Are there normally peaks for the H's that are 2-3 carbons away?arrow_forwardPlease help me understand this question. Thank you. Organic Chem 1arrow_forwardFor the reaction below, the concentrations at equilibrium are [SO₂] = 0.50 M, [0] = 0.45 M, and [SO3] = 1.7 M. What is the value of the equilibrium constant, K? 2SO2(g) + O2(g) 2SO3(g) Report your answer using two significant figures. Provide your answer below:arrow_forward
Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning
Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks Cole
Chemistry for Today: General, Organic, and Bioche...ChemistryISBN:9781305960060Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. HansenPublisher:Cengage Learning