The dimethylcyclohexane with the structure shown below is: ÇH3 ČH3 Select one: O a. a trans isomer with the CH3 groups in axial positions. O b. a cis isomer with the CH3 groups in equatorial positions. O c. a cis isomer with the CH3 groups in equatorial and axial positions. O d. a trans isomer with the CH3 groups in equatorial positions.

The dimethylcyclohexane with the structure shown below is: ÇH3 ČH3 Select one: O a. a trans isomer with the CH3 groups in axial positions. O b. a cis isomer with the CH3 groups in equatorial positions. O c. a cis isomer with the CH3 groups in equatorial and axial positions. O d. a trans isomer with the CH3 groups in equatorial positions.

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter6: Alkanes & Alkenes

Section: Chapter Questions

Problem 3E: Using your model of butane (CH3CH2CH2CH3) , complete the following graph of the anglebetween the two...

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Using your model of butane (CH3CH2CH2CH3) , complete the following graph of the anglebetween the two Me groups vs. potential energy. a. Label each Newman projection of butane on the graph with the words staggered, eclipsed, gauche, and anti, as appropriate. (Note that some structures will have more than one label.) b. Draw a wedge and dash bond representation of butane in its lowest P.E. conformation.
17. Which of the following structures are constitutional isomers? CH3 CH3 CH3 CH3 H3C II III IV O A.I, II, & II B. I, II, & IV C.I& II D. All are constitutional isomers E. All are configurational isomers 18. What is the IUPAC name of the compound shown below? CH3 CH(CH3)2 H,C H. A. 1,2,3-Trimethylbutane B. 2,3-Dimethylpentane C. 2,3,4-Trimethylpentane D. 2-1sopropylbutane OE 22,3-Trimethylbutane O O OO0
XX. CH₂ H. H Label each pair of compounds below as: تے H₂C a. conformational isomers b. configurational isomers constitutional isomers identical not isomers C. d. e. CH3 CH 3 CH 3 and CI H CH3 and CH3 H H₂C- Н. H H H3C12 CH₂ CH3 CH3 CH₂ CI H3C- * The same letter can be use more than once!
Convert each molecule into a skeletal structure. a. (CH3)½CHCH,CH2CH(CH3)2 c. CH3(CH2)½C(CH3)½CH(CH3)CH(CH3)CH(Br)CH3 нн HT TH ċ-C H CH3 c-c CH2 b. CH;CH(CI)CH(OH)CH3 d. CH3-C H limonene (oil of lemon)
What is the relationship between the following molecules? CH3 H. CH3 H. II H. H. H. H. H. H3C CH3 O Identicals Constitutional isomers O Resonance structures Conformational Isomers
3. Some students also confuse the structure of cyclohexanol with that of a phenol. Both structures have a six-carbon ring with a hydroxyl group attached. Use your learnings from the CHM 124 lecture course to explain how the six-carbon rings of cyclohexanol and phenol are different from one another.
10. Which of the following is the correct structure for 2,3-dimethyl pentane? A. B. C. D. CH3 CH3-CH-CHCH₂CH3 CH3 CH3 CH3 CH3-CH-CH₂CH-CH3 CH3 CH3 CH3CH₂-CH-CH₂CH₂ CH3 CH3-CH-CHCH₂CH3 CH₂CH₂
Convert each molecule into a skeletal structure. a. (CH3)2CHCH,CH;CH(CH3)2 c. CH3(CH2),C(CH3)½CH(CH3)CH(CH3)CH(Br)CH3 нн HT TH C-C H CH3 d. CH3-C C-C C-C b. CH3CH(CI)CH(OH)CH3 CH2 H limonene (oil of lemon)
The structures below are H. H CH₂ H H CH₂ A) not isomers B) conformational isomers C) cis-trans isomers D) structural isomers E) both B and D H H H CH3 H CH3
Which statement is true about these conformers? H. H. H H CH3 H3C H. H,C H,C H. H. A O A and B are equally stable O Difficult to predict O A more stable than B ) B more stable than
Which statement is incorrect about ?(butene (CH3-CH2-CH=CH2 Z)-But-2-ene is more stable than) O .(E)-but-2-ene Butene contains two sp2 hybridized O .C atoms Butene has two constitutional O .isomers Hydrogenation of butene gives O .butane
Model 2. Cyclohexane Chair Conformation Another helpful way to drawn a non-planar example of cyclohexane is to draw its most stable (lowest energy) conformation called a chair conformation. III 8. Build two models of cyclohexane. The chair conformation is the most stable conformation of cyclohexane because all of the bond angles around the carbon atoms are at 109.5ª and all carbon atoms are in the more stable staggered conformation. Cyclohexane is the only cyclic structure that allows all the bond angles around each carbon to be 109.5", thus is the only ring that adopts a true chair conformation. Form the chair conformation with both of your cyclohexane models. Look down each carbon carbon bond and verify that all carbons are in a staggered conformation. 9. 10. Because of this conformation, there are two types of positions a group can occupy when it is attached to a cyclohexane chair, either axial (A) or equatorial (E). 11. Axial hydrogens alternate straight up and straight down as we…