Homework Answers
(1) Chair and boat cyclohexane
Chair and boat cyclohexanes are the conformational isomers of cyclohexane. Conformational isomers are stereo isomers which can be interconverted by rotating around single bonds.
(2) ear
Chiral objects can be identified from their non-superimposible mirror images. That is, the chiral objects lacks plane or centre of symmetry. Here, ear is chiral as it does not possess a plane of symmetry or a centre of symmetry.
(3) Constitutional isomers
Constitutional isomers have same formula but different Connectivity.
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Which of the following are inter-convertible by rotation around single bonds? cis- & trans-alkene b. Constitutional...
Which of the following is an anti-conformer? Is the following alkene cis, trans, or neither? Is...
Which of the following is an anti-conformer? Is the following alkene cis, trans, or neither? Is the following alkene cis. trans, or neither? Identify the relationship between the following two structures. A. Enantiomers B. Identical C. Neither Locate the chiral centers of the following compound. Which of the following is the correct structure for a compound with the IUPAC name (S)-3-methylheptane. Assign the chiral center as R or S. Which of the following is the correct IUPAC name for the...
6. Predict which of the following two isomers (cis- or trans-) will undergo an E2 elimination...
6. Predict which of the following two isomers (cis- or trans-) will undergo an E2 elimination under the treatment with EtoNa in EtOH more rapidly. A) For the explanation of the reaction rate, draw chair conformations for each isomer, determine which conformation is more stable . B) Draw the major product and the mechanism of the reactions. CI cis-isomer trans-isomer
10) Which of the following are optically inactive? A) a 50-50 mixture of Rand Senantiomers B)...
10) Which of the following are optically inactive? A) a 50-50 mixture of Rand Senantiomers B) a racemic mixture C) every achiral compound D) a meso compound E) all the above 11) If (S)-glyceraldehyde has a specific rotation of -8.7, what is the specific rotation of (R)-glyceraldehyde? A) +8.7 B) -8.7 C) 0.0 D) cannot be determined from the information given 12) What is the relationship between the following compounds? HCI CH - CH₂ CH3 HEC HCI HEC X сін...
Define and provide examples of the following terms: a) n-alkanes b) alkene c) alkyne d) saturated...
Define and provide examples of the following terms: a) n-alkanes b) alkene c) alkyne d) saturated e) hydrophobic f) aromatic g) hydrophilic h) combustion i) methylene group j) methyl group k) common name l) IUPAC name m) conformations n) Newman projection o) eclipsed p) staggered q) gauche conformation r) anti conformation s) catalytic cracking t) cis-trans isomers of a ring u) chair conformation v) boat conformation w) distorted boat x) half chair conformation y) axial position z) equatorial position aa)...
1. How many degrees does the front carbon have to be rotated to result in an...
1. How many degrees does the front carbon have to be rotated to result in an eclipsing a. 60 b. 90 d. 120 e. 300 109.5 2. Rank the conformers from highest to lowest in energy? a. B, C, D, E, A b. C, B, E, A, D c. B, C, E, A, D d. C, B, A, E, D B, C, A, E, D e. 3. Which is the correct IUPAC name for 4-amino-3-ethyl-7-methyloctane? a. 3-amino-4-ethyl-7-methyloctane d. 4N-amino-3-ethyl-7-methyloctane b....
Q3) Which of the following alkenes is capable of forming cis-trans isomers? a. (CH3)2 CH2 b....
Q3) Which of the following alkenes is capable of forming cis-trans isomers? a. (CH3)2 CH2 b. (CH3)2 CHI C. CH3CH-CH2 e. CHF CHC 04) Which of the following is the general formula of an alkene containing one double bond? 05) What is the molecular formula of a cyclic alkane with 9 carbon atoms?
A. Which of the following Newman projections would represent the least stable conformer of 2,2,3....
PLEASE HELP WITH ALL.
A. Which of the following Newman projections would represent the least stable conformer of 2,2,3.3-tetramethylbutane, looking down the 2,3 bond? H3C H3C H3C H3C CH3 b) CH3 H3C e) a) c) CH3 H3C CH3 CH CH3 CH о он B. which one of the following compounds would be chiral? Br он о он a) но HO O он HO C C. which of the following could potentially be used to distinguish between enantiomers? b) NMR c)...
Which of the following structures is most stable? 2) How many stereoisomers does the molecule below...
Which of the following structures is most stable? 2) How many stereoisomers does the molecule below have? (СН), С+ снен снаси сна OH CH₃ br. a) 3 6) 4 c) 6 d) 8 e 9 3) Which of the following molecules below are chiral? 0) to A Boh A MOH HOS DBr e) 1, 2 and 3 a) Only 1 b) 1 and 3 c) 2 and 3 d) 1 and 3 What is the relationship between the following two...
1. Which of the following types of isomer differs only by the rotation about single bonds? a. d diastereomers const...
1. Which of the following types of isomer differs only by the rotation about single bonds? a. d diastereomers constitutional b. configurational e enantiomers c conformational 2. The Newman projection looking down the indicated bond in the following species is best represented by which of the following (, I, I, IV, or V)? Br HC H. н. CI сн, Br нс HC Br IV I1 а. I b II e.v c. III 3. Which substituents are anti to each other?...
HELP What is the common UPAC name for the following compound? 1 нс b) 1-methyl-3-cyclohexene d)...
HELP
What is the common UPAC name for the following compound? 1 нс b) 1-methyl-3-cyclohexene d) 1-methyl-4-cyclohexene a) 5 methylcyclohexene c 4 methylcyclohexene Methylcyclohexene e) Which of the following is capable of exhibiting cis-trans isomerism? a) 1-pentene 2. b) 1-butene c) 2- pentene d) Cyclohexene e) Ethene What is the relationship between the following compounds: 3. Н,с a) Conformational isomers b) Constitutional isomers c) Configurational isomer d) Structural isomers e) Positional isomers Which of the following is the most stable...
Which of the following is an anti-conformer? Is the following alkene cis, trans, or neither? Is the following alkene cis. trans, or neither? Identify the relationship between the following two structures. A. Enantiomers B. Identical C. Neither Locate the chiral centers of the following compound. Which of the following is the correct structure for a compound with the IUPAC name (S)-3-methylheptane. Assign the chiral center as R or S. Which of the following is the correct IUPAC name for the...
6. Predict which of the following two isomers (cis- or trans-) will undergo an E2 elimination under the treatment with EtoNa in EtOH more rapidly. A) For the explanation of the reaction rate, draw chair conformations for each isomer, determine which conformation is more stable . B) Draw the major product and the mechanism of the reactions. CI cis-isomer trans-isomer
10) Which of the following are optically inactive? A) a 50-50 mixture of Rand Senantiomers B) a racemic mixture C) every achiral compound D) a meso compound E) all the above 11) If (S)-glyceraldehyde has a specific rotation of -8.7, what is the specific rotation of (R)-glyceraldehyde? A) +8.7 B) -8.7 C) 0.0 D) cannot be determined from the information given 12) What is the relationship between the following compounds? HCI CH - CH₂ CH3 HEC HCI HEC X сін...
1. How many degrees does the front carbon have to be rotated to result in an eclipsing a. 60 b. 90 d. 120 e. 300 109.5 2. Rank the conformers from highest to lowest in energy? a. B, C, D, E, A b. C, B, E, A, D c. B, C, E, A, D d. C, B, A, E, D B, C, A, E, D e. 3. Which is the correct IUPAC name for 4-amino-3-ethyl-7-methyloctane? a. 3-amino-4-ethyl-7-methyloctane d. 4N-amino-3-ethyl-7-methyloctane b....
Q3) Which of the following alkenes is capable of forming cis-trans isomers? a. (CH3)2 CH2 b. (CH3)2 CHI C. CH3CH-CH2 e. CHF CHC 04) Which of the following is the general formula of an alkene containing one double bond? 05) What is the molecular formula of a cyclic alkane with 9 carbon atoms?
PLEASE HELP WITH ALL.
A. Which of the following Newman projections would represent the least stable conformer of 2,2,3.3-tetramethylbutane, looking down the 2,3 bond? H3C H3C H3C H3C CH3 b) CH3 H3C e) a) c) CH3 H3C CH3 CH CH3 CH о он B. which one of the following compounds would be chiral? Br он о он a) но HO O он HO C C. which of the following could potentially be used to distinguish between enantiomers? b) NMR c)...
Which of the following structures is most stable? 2) How many stereoisomers does the molecule below have? (СН), С+ снен снаси сна OH CH₃ br. a) 3 6) 4 c) 6 d) 8 e 9 3) Which of the following molecules below are chiral? 0) to A Boh A MOH HOS DBr e) 1, 2 and 3 a) Only 1 b) 1 and 3 c) 2 and 3 d) 1 and 3 What is the relationship between the following two...
1. Which of the following types of isomer differs only by the rotation about single bonds? a. d diastereomers constitutional b. configurational e enantiomers c conformational 2. The Newman projection looking down the indicated bond in the following species is best represented by which of the following (, I, I, IV, or V)? Br HC H. н. CI сн, Br нс HC Br IV I1 а. I b II e.v c. III 3. Which substituents are anti to each other?...
HELP
What is the common UPAC name for the following compound? 1 нс b) 1-methyl-3-cyclohexene d) 1-methyl-4-cyclohexene a) 5 methylcyclohexene c 4 methylcyclohexene Methylcyclohexene e) Which of the following is capable of exhibiting cis-trans isomerism? a) 1-pentene 2. b) 1-butene c) 2- pentene d) Cyclohexene e) Ethene What is the relationship between the following compounds: 3. Н,с a) Conformational isomers b) Constitutional isomers c) Configurational isomer d) Structural isomers e) Positional isomers Which of the following is the most stable...
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