ASSIGNMENT BOOKLET. Organic Chemistry. Bachelor s Degree Programme (B.Sc.) (Valid from July 1, 2011 to March 31, 2012) Please Note

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1 ASSIGNMENT BKLET HE-05 rganic hemistry Bachelor s Degree Programme (B.Sc.) (Valid from July 1, 2011 to March 31, 2012) It is compulsory to submit the assignment before filling in the exam form Please Note You can take electives (56 to 64 credits) from a minimum of TW and a maximum of FUR science disciplines, viz. Physics, hemistry, Life Sciences and Mathematics. You can opt for elective courses worth a MINIMUM F 8 REDITS and a MAXIMUM F 48 REDITS from any of these four disciplines. At least 25% of the total credits that you register for in the elective courses from Life Sciences, hemistry and Physics disciplines must be from the laboratory courses. For example, if you opt for a total of 64 credits of electives in these 3 disciplines, at least 16 credits should be from lab courses. You cannot appear in the Term-End Examination of any course without registering for the course. therwise, your result will not be declared and the onus will be on you. School of Sciences Indira Gandhi National pen University Maidan Garhi, New Delhi (For July, 2011 cycle) 1

2 Dear Student, We hope, you are familiar with the system of evaluation to be followed for the Bachelor s Degree Programme. At this stage you may probably like to re-read the section on assignments in the Programme Guide that we sent you after your enrolment. A weightage of 30 percent, as you are aware, has been earmarked for continuous evaluation, which would consist of one tutor-marked assignment. The assignment is based on Blocks 1, 2, 3 and 4. Instructions for Formatting Your Assignments Before attempting the assignments, please read the following instructions carefully. 1 n top of the first page of your answer sheet, please write the details exactly in the following format: ENRLMENT N:.. NAME:.. URSE DE URSE TITLE :... :... ADDRESS:.... ASSIGNMENT N.:... STUDY ENTRE :... (NAME AND DE) DATE:... PLEASE FLLW THE ABVE FRMAT STRITLY T FAILITATE EVALUATIN AND T AVID DELAY. 2 Use only foolscap size writing paper (but not of very thin variety) for writing your answers. 3 Leave 4 cm margin on the left, top and bottom of your answer sheet. 4 Your answers should be precise. 5 While writing answers, clearly indicate the Question No. and part of the question being solved. 6 Please note that: Last date for submission of Assignment is March 31, i The response to this assignment is to be submitted to the Study entre oordinator within eight weeks of the receipt of this booklet in order to get the feedback and comments on the evaluated assignment. In any case, you have to submit the assignment response before appearing in the term end examination. 7 We strongly suggest that you should retain a copy of your assignment responses. Wishing you all good luck. 2

3 Note: * Tutor Marked Assignment rganic hemistry This assignment is based on all the four Blocks of the entire course. ourse ode: HE-05 Assignment ode; HE-05/TMA/ Maximum Marks: 100 * All questions are compulsory. Marks for the questions are shown within brackets on the right hand side. * Please answer in your own words; do not copy from the course material. Q.1 a) Give the IUPA names of the following compounds: (3) H H H H i H H b) Write the structure of the following compounds: (2) p- Nitrophenylethanoic acid N, N Dimethylbenzamide Q.2 a) Assign E/Z configuration to the following compounds: (3) H H 3 H( ) 2 H H H 3 l b) Write the enantiomers of 2-butanol. (2) Q.3 Draw the potential energy diagram for various conformations of butane and discuss their relative stabilities. (5) Q.4 a) Arrange pentane, 2-methylbutane and 2, 2 - dimethylpropane in the increasing order of their melting points and give reason for your answer. (3) b) Define auxochromes and chromophores. (2) Q.5 Define tautomerism and illustrate it with the help of an example. Also list the differences between tautomerism and resonance. (5) Q.6 a) Give any three methods for preparation of alkanes/cycloalkanes. (3) b) Discuss briefly physical properties of alkanes. (2) Q.7 a) Explain the structure of diene. (2) b) Give any three reactions of alkenes. (3) 3

4 Q.8 a) Give mechanism of hydrohalogenation of alkynes. (2) b) Explain the acidity of alkynes. (3) Q.9 Discuss various limitations of Fridel-rafts alkylation of benzene. (5) Q.10 a) Give the structure of the following: (2) 1,2-oxazol 1,2-Diazine b) Write the various resonance structures of carbocation formed during electrophilic substitution of furan. (3) Q.11 omplete the following reactions: (5) 6 H 5 NH 2 NaN 2 /Hl (cold) ul/hl H + Pl 5 i + MgBr dry ether H + /H 2 iv) l H 2 /Pd(BaS 4 ) v) H H + H 2 H 2 S 4 /Hg2+ Q.12 Explain how and why the solvolysis of 2-bromo-3-mathylbutane yields 2-methyl 2-butanol as the major product. Write all the steps involved in this process. (5) Q.13 What is the expected major product of the reaction shown here? Write all steps involved in this process. (5) Br 1. Mg, THF 2. o 3. NH 4 l (aq) Q.14 Write the mechanism of the following reaction. (5) + H NaH,H 2 EtH Q.15 What is Fischer esterification? Give its mechanism. (5) Q.16 How will you prepare 2-hydroxybenzenecarboxylic acid using Kolbe Schmidt reaction? Write the steps involved in this reaction. (5) 4

5 Q.17 Explain the following reactions using suitable examples: (5) Rosenmund reduction Bouveault- Blanc reduction Q.18 How can 1, 4 dinitrobenzene be obtained from benzenamine? (5) Q.19 Discuss Gabriel synthesis of primary amines. Also give its advantages and limitations. (5) Q.20 List various classes of alkaloids and give one example of each type. (5) 5