Download GTU BE/B.Tech 2017 Winter 3rd Sem Old 133501 Organic Chemistry For Technologists I Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 3rd Sem Old 133501 Organic Chemistry For Technologists I Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2017
Subject Code:133501 Date:14/11/2017

Subject Name: Organic Chemistry for Technologists-I

Time: 10:30 AM to 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Write the structural formulas and give IUPAC names for all isomeric alcohols
of the molecular formula C5H12O
07
(b) How are alkanes prepared? Give their classification. 07

Q.2 (a) How does CH?CH react with the following reagents?
(i) H2/Pd (ii) H2/Pd/BaSO4 (iii) HBr
(iv) Cu2Cl2/NH4OH (v) Na/liqNH3 (vi) AgNO3/NH4OH
(vii) HCN/Ba(CN)2

07



(b) What is the structure of carbonyl group? How does it react with;
a. HCN b. NaHSO3 c. NH2OH.

07
OR
(b) How are thioethers prepared? Discuss their chemical properties. 07


Q.3 (a) Discuss the mechanism of SN1 and SN2 reaction of alkyl halide. 07
(b) 1. How does diethyl ether react with the following reagents?
a. O2/long contact
b. Cold Conc. H2SO4
c. PCl5
2. A hydrocarbon (A) adds one mole of hydrogen in the presence of a
platinum catalyst to form n-Hexane. When (A) is oxidized with hot
concentrated KMnO4, a single carboxylic acid containing three carbon is
isolated. Give the structure and name of (A).

03



04
OR
Q.3 (a) 1. What are Carbonium ions? Arrange the following according to their
increasing stability. Explain your answer.
a. CH3CH2CH2CH2
+
b. (CH3)3C
+

c. CH3CH2(CH3)CH
+

2. Explain why benzyl carbonium ion is more stable than ethyl carbonium ion.
03
04
(b) Write a equation for the preparation of n-butane from,
a. n-Butyl bromide
b. Ethyl bromide
c. 2-Butene

07


Q.4
(a) Write a note on: Oxidation of alcohol. 07

(b) Give only reaction for following conversion:
a. n-propyl alcohol ? Isopropyl alcohol
b. Isopropyl bromide ? n-propyl bromide
c. Isopropyl alcohol ? Propane
07

OR



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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2017
Subject Code:133501 Date:14/11/2017

Subject Name: Organic Chemistry for Technologists-I

Time: 10:30 AM to 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Write the structural formulas and give IUPAC names for all isomeric alcohols
of the molecular formula C5H12O
07
(b) How are alkanes prepared? Give their classification. 07

Q.2 (a) How does CH?CH react with the following reagents?
(i) H2/Pd (ii) H2/Pd/BaSO4 (iii) HBr
(iv) Cu2Cl2/NH4OH (v) Na/liqNH3 (vi) AgNO3/NH4OH
(vii) HCN/Ba(CN)2

07



(b) What is the structure of carbonyl group? How does it react with;
a. HCN b. NaHSO3 c. NH2OH.

07
OR
(b) How are thioethers prepared? Discuss their chemical properties. 07


Q.3 (a) Discuss the mechanism of SN1 and SN2 reaction of alkyl halide. 07
(b) 1. How does diethyl ether react with the following reagents?
a. O2/long contact
b. Cold Conc. H2SO4
c. PCl5
2. A hydrocarbon (A) adds one mole of hydrogen in the presence of a
platinum catalyst to form n-Hexane. When (A) is oxidized with hot
concentrated KMnO4, a single carboxylic acid containing three carbon is
isolated. Give the structure and name of (A).

03



04
OR
Q.3 (a) 1. What are Carbonium ions? Arrange the following according to their
increasing stability. Explain your answer.
a. CH3CH2CH2CH2
+
b. (CH3)3C
+

c. CH3CH2(CH3)CH
+

2. Explain why benzyl carbonium ion is more stable than ethyl carbonium ion.
03
04
(b) Write a equation for the preparation of n-butane from,
a. n-Butyl bromide
b. Ethyl bromide
c. 2-Butene

07


Q.4
(a) Write a note on: Oxidation of alcohol. 07

(b) Give only reaction for following conversion:
a. n-propyl alcohol ? Isopropyl alcohol
b. Isopropyl bromide ? n-propyl bromide
c. Isopropyl alcohol ? Propane
07

OR



2
Q.4 (a) Explain Wurtz synthesis, Corey-house synthesis and Kolbe?s synthesis for
preparation of Alkane.

07


(b) (i) Define Geometrical isomerism. State the necessary condition for a compound
to show Geometrical isomerism. Illustrate your answer with examples.
(ii) What is Inductive effect? Give one example of a system where this effect is
operative.
04

03

Q.5 (a) Draw structure corresponding to the following IUPAC names;
a. 2-methyl-1,5-hexadiene
b. 2-ethyl-2,2-dimethyl-3-heptene
c. 2-amino-3-hydroxy-4oxopentan-1-oicacid
d. 1-methyl-1,3-cyclopentadiene
e. 1,5-heptadiyne
f. 3-chloroprop-1-ene
g. 2-methyl-4-nitro-2-pentanol


07


(b) (i) Describe homolytic & heterolytic fission of a covalent bond. How carbocation,
carbanion & free radicals are formed.
(ii) Write a note on Diazotization reaction.
03
04
OR
Q.5 (a) Write Physical properties of alcohol with explanation


07

(b) Write only chemical reaction for following conversion:
a. Benzene ?Benzoic acid
b. Benzaldehyde ?Nitrobenzene

07

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