Set No. 1

Code No: RR210802

1. Discuss about Electrometric effect.

in

II B.Tech I Semester Supplimentary Examinations, May/Jun 2009 ORGANIC CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ [16]

[16]

ld .

2. Write a detailed note on Perkin reaction with mechanism.

3. (a) How do you detect whether an organic reaction is going by free-radical mechanism or not ?

(b) Describe the chlorination of ethane in the presence of peroxide or UV light. [8+8]

i. Bromochloroiodomethane ii. sec- Butyl chloride

or

4. (a) Draw the R and S configurations of the following:-

uW

(b) Describe a method to determine the optical activity of organic molecules. [10+6] 5. How will you assign E-Z notations to geometrical isomers? Explain with suitable examples. [16] 6. (a) What is Cellulose? How is it obtained? (b) Write a note on the advantages and disadvantages of fibres based on cotton and polyester. [6+10]

nt

7. (a) Compare the basic nature of the following pairs of compounds and justify your comparison. i. Pyridine and pyrrole ii. Pyridine and trimethylamine.

Aj

(b) How will you prepare Quinoline from aniline?

[8+8]

8. Give the preparation and uses of the following dyes? (a) Bismark brown

(b) Fluoroscien (c) Congo Red

[6+5+5] ⋆⋆⋆⋆⋆

1 of 1

Set No. 2

Code No: RR210802

in

II B.Tech I Semester Supplimentary Examinations, May/Jun 2009 ORGANIC CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Define and explain Inductive effect.

[10+6]

ld .

(b) Explain why aniline is less basic in comparison with methyl amine. 2. (a) Discuss about hydroboration with reaction mechanism. (b) Describe the Perkin condensation.

[8+8]

3. (a) What are peroxides ? How are they prepared?

(b) How are peroxides useful in generating radicals?

or

(c) Describe the halogenation of alkanes using free-radicals.

[6+5+5]

4. (a) Discus the methods of resolution of recemic mixtures. (b) What is the criterion of enantiomerism?

[10+6]

uW

5. (a) How maleic acid and fumaric acid react with acetyl chloride? What inference you get from this reaction? (b) Write a note on E and Z configurations of geometrical isomens.

[8+8]

6. (a) What is Vulcanisation? Why is this done? (b) Describe properties and uses of cellulose.

[8+8]

7. (a) Pyrrole is weaker base than pyridine. Explain.

nt

(b) What is Tetrahydnofman? How will you prepare it? Mention its important uses. [7+9]

Aj

8. Discuss briefly about the azo dyes and discuss the method of preparation of some important azo dyes? [16] ⋆⋆⋆⋆⋆

1 of 1

Set No. 3

Code No: RR210802

1. (a) Explain the following applications of Inductive effect

ld .

i. Effect of bond lengths ii. Dipole moment iii. reactivity of alkyl halide

in

II B.Tech I Semester Supplimentary Examinations, May/Jun 2009 ORGANIC CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆

(b) Discuss the strength of carboxylic acid based upon Inductive effect.

[9+7]

2. Give reaction mechanism of the following figure 2a

uW

or

(a)

[8+8]

Figure 2a

OH −

(b) 2CH3 CHO −→

3. (a) What is a free-radical ?

(b) How do you get bromine free radicals? (c) Describe the free-radical mediated addition of HBr to alkenes.

[4+6+6]

nt

4. (a) Give an account of isomerism exhibited by lactic acid. What is meant by Resolution? (b) Describe a method for resolution of mixture of optically active acids.

[8+8]

5. (a) How maleic acid and fumaric acid react with acetyl chloride? What inference you get from this reaction?

Aj

(b) Write a note on E and Z configurations of geometrical isomens.

[8+8]

6. (a) Describe the preparation of natural rubber from latex. (b) What are bakelite resins and how are they made.

[8+8]

7. (a) How will you prepare pyridine? Indicate how does it react with electrophilic reagents. (b) With suitable chemical equations, indicate the products for the following reactions. i. Quinoline with LiAlH4 1 of 2

Set No. 3

Code No: RR210802 ii. Quinoline with alkaline KMnO4 iii. Isoquinoline with fuming H2 SO4 iv. Isoquinoline with sodamide.

[8+8]

in

8. What makes an organic compound coloured? Give the method of preparation and uses of Malachite Green and Congo Red. [16]

Aj

nt

uW

or

ld .

⋆⋆⋆⋆⋆

2 of 2

Set No. 4

Code No: RR210802

in

II B.Tech I Semester Supplimentary Examinations, May/Jun 2009 ORGANIC CHEMISTRY (Chemical Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Define and explain Inductive effect.

[10+6]

ld .

(b) Explain why aniline is less basic in comparison with methyl amine.

2. Show the reaction mechanism of aldol condensation and describe its uses.

[16]

3. (a) Describe the chlorination of methane in the presence of peroxides. (b) Discuss the chlorination of ethane in the presence of heat.

[8+8]

or

4. (a) Assign R and S configurations to the enantiomers of glyceraldehyde with the help Of sequence rules. (b) Write a note on sequence rules for R.S notation.

[6+10]

5. (a) How maleic acid and fumaric acid react with acetyl chloride? What inference you get from this reaction?

uW

(b) Write a note on E and Z configurations of geometrical isomens.

[8+8]

6. (a) What is natural rubber? What is its structure? How is it obtained from latex? (b) Discuss the process of Vulcanisation of rubber.

[12+4]

7. (a) Compare the reactivity of pyrrole and furan towards electrophilic substitution reaction. [8+8]

nt

(b) Pyridine is less basic than ethylamine. Why? 8. Explain what are (a) Direct dyes

(b) Mordant dyes

Aj

(c) Vat dyes

(d) Ingrain dyes with examples.

[16] ⋆⋆⋆⋆⋆

1 of 1