{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

CH231_2002FALL_EXAM1__[0] - Organic Chemistry CH231 October...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Organic Chemistry CH231 October 2002 First Examination (l0) 1.Write resonance structures for the following: (a) formate ion, HCO2’ (b) formaldehyde. H200. and (c) nitrite ion, NOQ’ . Note : atomic numbers , 0:6 , O: 8, and N: 7 . 2. State whether the following reactions have a positive or negative change in entropy , and explain your choice. . H +CH(‘H=CH (fl “" 2 3 2 ———-> (‘H3(H2(‘lh 0” <] ———> CH3CH =CH2 (c)('H3(‘()2(aq) + H,o*(aq) ————> (‘H,(Y)2H +H2() 3. Give the order of each of the following reactions U0) (a)H2 +|2 = 2HI; rate =k(H9(|2) (b)CHCl3 + Br2 = CBrC13 + HBr ; rate = k (CHCI3 )(Br2)1’2 4.Write structures for the following compounds : (a) 3-chloro bicyclo [ 2.2.1 ] heptane (b) 3-chloro- (I g) 2-methylhexane (c)2,3,4-trimethylpentane (d)trans1.2-difluorocyclobutane (e) 4-(1-methylethyl) heptane 5. Indicate with an equation how one could convert the following: ‘) mumi )EHn 4——> ((7H,)2CHI) 003 llC’C ., 1 (blimthylacclylcnc __'__.> CHJCDZCDJ gC’H’ ‘ -J: 6. The reaction CH4 + Cl . = CH3 . + HCl has an activation enthalpy (AH ) of + 4 Kcal/mol a 0) and a ( A He) of + 2 Kcal/mol. Draw an energy profile diagram for the reaction. Cf) 7. Draw structures for the two chair conformations of trans - and cis - 1,3 dimethylcyclohexane. ‘ 8. (a) Calculate the specific rotation of a compound, if a solution containing 0.75 grams/ tomL is placed K 03 in a 1 dm polarimeter tube and its observed rotation at 25 degrees C (D line) is + 1.2 degrees , (b) What is the specific rotation of the enantiomer ? 9. Assign R and S designations to the following compounds: 3 (a) B (b) (c) - u Q5 s4 it! a Hozcrcdg “TB' l s H Br Cl ‘ 10. How many stereo isomers can be obtained from the hydrogenation of both double bonds of (‘0) following compound. Draw the structures . (‘H2 HZC ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern