Exam Details
| Subject | Organic Reaction Mechanism | |
| Paper | ||
| Exam / Course | Bachelor Degree Programme(Elective Course: Chemistry) | |
| Department | School of Sciences (SOS) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
What are stereospecific reactions Explain by taking a suitable example. What is isotope effect? How does it help in determining the mechanism of a reaction? Discuss the effect of nature of substratelnucleophile in a SN1 reaction.
2. Justify the following statements NO2 is a meta directing group in electrophilic aromatic substitution reactions.
Addition of HBr to propene gives 2-bromopropane as the major product.
(c) Reaction of
<br><br> <img src='./qimages/9460-2c.jpg'>
in methanol proceeds with retention of configuration.
3.(a) Write the commonly used reactions by which carbonyl compounds are reduced into hydrocarbons.
(b) Explain Cope Rearrangement with the help of a suitable example.
(c) Write the steps involved in the reaction in which ethanol is converted into chloromethane using SOCl2.
4.(a) What is Huckelrule for aromaticity Apply the rule to the following compounds and show whether they are aromatic or not.
<br><br> <img src='./qimages/9460-4a.jpg'> A compound forms an equimolar mixture of propanone and butanone on treatment with ozone followed by reaction with Zn/H20. Identify the compound and write the reactions.
5.(a) Complete any five of the following reactions <img src='./qimages/9460-5a.jpg'> What happens when propanamide is treated with bromine in presence of sodium hydroxide? Write the mechanism of the reaction.
6.(a) Explain the cleansing action of soap. Why cannot soap be used in hard water Describe the mechanism for chain growth polymerisation of ethene.
(c) Define any two of the following: Phosphorescence
(il) Anti-inflammatory drug
(iii) Disperse dyes
Chromophore
7.(a) How will you prepare any three of the following?
(i) 4-methyl-2-pentanone from acetoacetic ester
(ii) Succinic acid from malonic ester
(iii) 2-methylbutan-2-ol from butanone using a suitable Grignard reagent
1,3,5-tribromobenzene from aniline
Discuss the photolysis of hexan-2-one.
8.(a) Write the mechanism of any two of the following reactions Cannizzaro reaction
(ii) Pinacol-pinacolone rearrangement
(iii) Reimer-Tiemann reaction
p-Chlorotoluene on reaction with KNH2 in liquid ammonia gives a mixture of m-and p-toluidine. Explain.
2. Justify the following statements NO2 is a meta directing group in electrophilic aromatic substitution reactions.
Addition of HBr to propene gives 2-bromopropane as the major product.
(c) Reaction of
<br><br> <img src='./qimages/9460-2c.jpg'>
in methanol proceeds with retention of configuration.
3.(a) Write the commonly used reactions by which carbonyl compounds are reduced into hydrocarbons.
(b) Explain Cope Rearrangement with the help of a suitable example.
(c) Write the steps involved in the reaction in which ethanol is converted into chloromethane using SOCl2.
4.(a) What is Huckelrule for aromaticity Apply the rule to the following compounds and show whether they are aromatic or not.
<br><br> <img src='./qimages/9460-4a.jpg'> A compound forms an equimolar mixture of propanone and butanone on treatment with ozone followed by reaction with Zn/H20. Identify the compound and write the reactions.
5.(a) Complete any five of the following reactions <img src='./qimages/9460-5a.jpg'> What happens when propanamide is treated with bromine in presence of sodium hydroxide? Write the mechanism of the reaction.
6.(a) Explain the cleansing action of soap. Why cannot soap be used in hard water Describe the mechanism for chain growth polymerisation of ethene.
(c) Define any two of the following: Phosphorescence
(il) Anti-inflammatory drug
(iii) Disperse dyes
Chromophore
7.(a) How will you prepare any three of the following?
(i) 4-methyl-2-pentanone from acetoacetic ester
(ii) Succinic acid from malonic ester
(iii) 2-methylbutan-2-ol from butanone using a suitable Grignard reagent
1,3,5-tribromobenzene from aniline
Discuss the photolysis of hexan-2-one.
8.(a) Write the mechanism of any two of the following reactions Cannizzaro reaction
(ii) Pinacol-pinacolone rearrangement
(iii) Reimer-Tiemann reaction
p-Chlorotoluene on reaction with KNH2 in liquid ammonia gives a mixture of m-and p-toluidine. Explain.
Other Question Papers
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Subjects
- Biochemistry
- Inorganic Chemistry
- Organic Chemistry
- Organic Reaction Mechanism
- Physical Chemistry
- Spectroscopy