Can I get all answers with full solutions please. Thank you
DUBLIN CITY UNIVERSITY
SEMESTER 1 EXAMINATION 201 1
Chemical & Pharmaceutical Sciences
Environmental Science & Health
Genetics & Cell Biology
Science Education (Ycar 3)
SHSAX MODULE: CS204
)ATE: January 20 11 TIME:
EXAMINERS: Dr. P. James
Dr. P. O'Malley DIJRATION: 2 Hours INSTRUCTIONS: Answer THREE questio~is. 5126
5312 'THE USE OF PROGRAMMABLE OR TEXT STORING CALCULATORS IS
PLEASE NOTE THAT WHERE A CANDIDATE ANSWERS MORE THAN
T1111: REQUIRED NUMBER OF QUESTIONS, THE EXAMINER WILL
MARK A1,L QUESTIONS ATTEMPTED AND THEN SELECT THE
HI(; HEST SCORING ONES. DO NOT TURN OVER THIS PAGE UNTIL YOU ARE TOLD TO DO SO - This booklet contuin.~
.five pages including the cover,shc.e/
Page l ol' S / CS204 Semester l Answer THREE questions. 1. Answer ALL parts. [Marks: (a) 60% (b) 40%]
(a) Propose a reasonable synthesis of each of the following disubstituted
aromatics from benzene: I COOH (1)) Strongly electron withdrawing substituents on benzene rings are w z e i ~ ~
directing. Show by drawing the resonance structirres for the various
possible intermediates why this is the case using nitrobenzenc as an
example. Page 2 of 5 1 CS204 Semester 1 2. Answer A1,L parts. [Marks: (a) 50% (b) 50% ] (a) For each of the following molecules, drawn as Fischer projections, assign Ihe
absolute stereochemistry (R or 5') at the chiral centre (or centres). Show your
CH20H (b) CH,OH CH3 CI 'I'hc structure of me,s.o-butane-2,3-diol is shown. (i) Redraw the structure and assign R or S to each of the chiral ccntres in
rtze.so-butane-2,3-diol. (ii) Draw a Fischer projection of meso-butane-2,3-diol. (Note: 11 should
have a plane of symmetry) Page 3 of 5 1 CS204 Semester I 3. Answer ALL parts. [Marks: (a) 40% (b) 60% ]
(a) ( i ) Show the Mechanism for the following base catalysed double
Aldol condensation reaction, illustrating how the major dehydration
product is formed: (iii) Show the Mechanism for the following two step Malonic Estcr
synthesis, showing the products formed: (h) For each of the following reactions, name the 'reaction type' and show
the product(s) formed : (ii) Page 4 of 5 I CS204 Semester 1 3. ( b ) cont'd
(v) 4. Answer ALL parts. [Marks: (a) 40% ; (b) 60% ]
(a) ( i ) Name the following compounds (ii) I)~;Lw both chair conformations for cis-1-tert-butyl-2-methylcyclohcxa~~e. atid explain which is the more stable conformer. (b) Complete reactions I and 1 , indicating which reaction proceeds by an
SN1 mechanism and which reaction proceeds by an SN2mechanism.
I CH3Br + -OH - Itcferring to reactions 1 and 11, write notes comparing the SN1mccha~~ism
and SN2mechanisn~i n terms of suhslrule, nucleophile, /euvirzg ~ V ~ L I J I ,
1.c11e I t r i d , and ~tereochemi~stry. Ilraw the energy profile diagram for each of the above reactions, I and 11. Page 5 of 5 1 CS204 Semester I
This question was answered on: Sep 13, 2020Buy this answer for only: $15
This attachment is locked
Pay using PayPal (No PayPal account Required) or your credit card . All your purchases are securely protected by .
About this QuestionSTATUS
Sep 13, 2020EXPERT
GET INSTANT HELP/h4>
We have top-notch tutors who can do your essay/homework for you at a reasonable cost and then you can simply use that essay as a template to build your own arguments.
You can also use these solutions:
- As a reference for in-depth understanding of the subject.
- As a source of ideas / reasoning for your own research (if properly referenced)
- For editing and paraphrasing (check your institution's definition of plagiarism and recommended paraphrase).
NEW ASSIGNMENT HELP?
Order New Solution. Quick Turnaround
Click on the button below in order to Order for a New, Original and High-Quality Essay Solutions. New orders are original solutions and precise to your writing instruction requirements. Place a New Order using the button below.
WE GUARANTEE, THAT YOUR PAPER WILL BE WRITTEN FROM SCRATCH AND WITHIN A DEADLINE.