Which of the following molecules is chiral at room temperature (25 degree C) and why?
A.1,1-dimethylcyclohexane
B.cis-1,2-dimethylcyclohexane
C.trans-1,3- dimethylcyclohexane
D, trans- 1,4 - dimethylcyclohexane
Which of the following molecules is chiral at room temperature (25 degree C) and why? A.1,1-dimethylcyclohexane...
Which of the following compounds can in principle be isolated in optically active form at room temperature?a. cis-1,4-dimethylcyclohexaneb.trans-1,3-dimethylcyclohexanec.1,1-dimethylcyclohexaned.cis-1-ethyl-3-methylcyclohexane
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...
b. Which of the following alkanes has the highest bolling point? 2,3-dimethylbutane: 2-methylpentane; 3-methylpentane; hexane c. Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups? 1,1-dimethylcyclohexane; cis-1,2-dimethylcyclohexane; trans-1,2-dimethylcyclohexane; trans-1,3-di methylcyclohexane d. Which of the following compounds can adopt a chair conformation which there are no axial methyl groups? cis-1,2-dimethylcyclohexane; cis-1,3-dimethylcyclohexane; trans-1,3-dimethylcyclohexane; cis-1.4-dimethylcyclohexane cis-1,2-dimethvcyclohexane (Enter the numerical value only, without any units)? e. What is the approximate di hedral angle between the...
Decide which one of the following cycloalkanes shows cis-trans isomerism and draw a structural formula for its cis isomer. 1,2-dimethylcyclohexane ethylcyclopropane Decide which one of the following cycloalkanes shows cis-trans isomerism and draw a structural formula for its trans isomer. 1,1-dimethylcyclohexane 1,4-dimethylcyclohexane
Following are the alternative chair conformations for trans-1,4-dimethylcyclohexane: . Using the data for ΔG for monosubstituted cyclohexanes at room temperature (25ºC) and the representative value* for the gauche interaction of two equatorially positioned substituents in the 1,2-position: a) Calculate the difference in the Gibbs free energy between the second and first conformation including the algebraic sign. kJ/mol b) Given your value in (a), calculate the percent of the chair, indicated as B, presented in an equilibrium mixture of the conformers...
Draw the following molecules: 1. (Z)-3-heptene 2. (R)-3-fluorocycloheptene 3. (R)-2-ethyl-2-hexanol 4. trans-1,2-dimethylcyclohexane 5. 1,1-dipentylcyclopropane 6. (R)-1-chloro-2-methylpropane 7. (2R,3S)-2,3-dibromobutane
11. Build the chair and boat conformations and identify the most stable conformation. Identify the 1,3-diaxial interactions. 12. Draw the most stable conformation of (a) ethylcyclohexane (b) 3-isopropyl-1,1-dimethylcyclohexane (c) cis-1-tert-butyl-4-isopropylcyclohexane 13. Draw all possible conformations of 1,4-dimethylcyclohexane and identify the most stable conformation 14. (a) Draw both chair conformations of cis-1,2-dimethylcyclohexane, and determine which conformer is more stable. (b) Repeat for the trans isomer. (c) Predict which isomer (cis or trans) is more stable. 15. (a) Draw both chair conformations...
In each of the cases below, which isomer is more stable? a) 1,4-dimethylcyclohexane (cis/trans?): b) 1-bromo-2-methylcyclohexane : (cis/trans?) c) 1,3-diethylcyclohexane (cis/trans?)
5.2 1a) Decide which one of the following cycloalkanes shows cis-trans isomerism and draw a structural formula for its cis isomer. 1,2-dimethylcyclohexane 1,1-dimethylcyclobutane Use the wedge/hash bond tools to indicate stereochemistry where it exists. 1b) Decide which one of the following cycloalkanes shows cis-trans isomerism and draw a structural formula for its trans isomer. 1,1-dimethylcyclohexane 1,3-dimethylcyclohexane Use the wedge/hash bond tools to indicate stereochemistry where it exists. 1c) Decide which one of the following cycloalkanes shows cis-trans isomerism and draw...
can questions 1-9 please be answered and why are they the answer 1. How many sp hybridized carbon atoms are present in the following molecule? (A) 3 (B) 4 5 н.с (D). 6 2. Which bond is the longest in the following molecule? (A) (B) CECH (C) (D) 3. Which of the following molecules is chiral at room tempernture (25 C)? (A) 1,1-dimethylcyclohexane (B) cis-1,2-dimethyleyelohexanc (C) trans-,3-dimethyleyclohexane (D) trans-1,4-dimethylcyclohexane 4. Which group is an aldehyde? н н (C) (D) (A)...