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Title Name IGNOU B.A.Chemistry Solved Assignment for CHE-5 Chemistry
University IGNOU
Service Type Assignment
Course BA(Chemistry)
Semester 2018-2019 Course: BA(Chemistry)
Session
Short Name or Subject Code CHE-5 Chemistry
Commerce line item Type 2018-2019 Course: BA(Chemistry)
Product Assignment of BA(Chemistry) 2018-2019 (IGNOU)
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Questions:-


(Tutor Marked Assignment)

Course Code: CHE- 5

Assignment Code: CHE-5/TMA/2018

All answer below                                                                                                                      

                                                                                                                            Maximum Marks: 100

  1. a) Give the IUPAC names of the following compounds:

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  1. Draw cis and trans- isomers of 1,3-cyclobutanedicarboxylic acid. Comment on the (5) dipole moment of these isomers.

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What are racemic mixtures? How are they obtained? Discuss one method of their (5) resolution.

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  1. Give reason for the following:

(i) β-carotene is a red coloured compound.

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ii). Carbonyl compounds absorb radiation in the infrared region.

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iii). CDCl3 is used as a solvent for recording the NMR spectrum of a compound.

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  1. Arrange the following in the increasing order of their acidic strengths:

propanoic acid, ethanoic acid, 2-fluoroethanoic acid, 2-chloroethanoic acid, dichloroethanoic acid

Also give reason in support of your answer.

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  1. a) Explain the following:

(i) Alkanes with odd number of carbon atoms have low melting point than those with an even number

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  1. Wurtz reaction is not very useful when two different alkyl halides are used.

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  1. b) Describe the following: (3)

(i) Bergius Process

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ii). Fischer Process

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  1. a) Explain the following in one to two lines.

(i) Alkenes are more soluble in water than corresponding alkanes

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ii). Addition reactions of alkenes are exothermic processes.

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iii). Hydroboration appear as anti-Markownikoff’s addition.

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  1. b) Fill in the following blanks:

(i) In the UV spectrum, the ethylenic chromophore shows an absorption band below __________nm.

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  1. a) Arrange the following in the decreasing order of their basic strength:

alkanide anion; alkenide anion; alkynide anion

Justify your answer.

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  1. b) How will you prepare the following ?

(i) 10 -Hexyne from ethyne

(ii) Ethanol from ethyne

(iii) 3-Hexanone from 3-hexyne.

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  1. (a) What is resonance energy? Explain taking the example of benzene. (2½)

(b) What are the limitations of Friedel-Crafts alkylation?

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  1. (a) 2-Position of pyrrole is more reactive towards electrophilic substitution than 3-position. Explain giving all possible resonance structures of carbocations formed. Explain.

(b) Predict the product(s) of the following reactions:

(i) Nitration of azole

(ii) Friedel-Crafts acylation of pyridine

(iii) Reduction of pyrrole with zinc and ethanoic acid.

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  1. Among alkyl halides, order of reactivity of SN2 reaction is

CH3X > p-RX > Sec-RX > tert-RX

Discuss the factors which are mainly responsible for this order.

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  1. Write the chemical equation for following named reactions:

(a) Reimer-Tiemann reaction

(b) Kolbe reaction

(c) Claisen reaction

(d) Knoevenagel reaction

(e) Willgerodt reaction

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  1. Suggest the reaction that can best be used to prepare following ethers by Williamson ether synthesis

 (a) CH3CH2 – O - CH = CH2

(b) CH3CH2CH = OCH3

                 CH3

Ans.

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  1. Explain Hell-Vollhard-Zelinski reaction. Also illustrate its synthetic importance.

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  1. Write chemical reactions for the following:

(i) Kolbe Schmidt reaction

(ii) Strecker synthesis

(iii) Dieckmann cobndensation

(iv) Knoevenagel reaction

(v) Perkin condensation

  1. Discuss various methods of reduction of esters giving the products formed.

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  1. (a) Why do nitro compounds dissolve in sodium hydroxide?

(b) What is aci form of nitroethane? Discuss.

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  1.  
  1. What are nucleotides? Draw the structures of nucleotides present in DNA and give their names.

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Questions:-



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