Programme Code : BDP
Course Code : CHE-O5
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Year : 2012 Views: 727 Submitted By : r.s.banait On 29th September, 2012

Do you have solution for this Question. If yes    I aslo want solution.

Q.


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

Br

(CH3)2 CH CHO

NH

i)

ii)

iii) C2H5

(3)

b) Write the structures of the following compounds:

i) Ethyl – 2 – ethanoylhexanoate

ii) 1,2- dimethoxy – 4 – nitrobenzene (2)

Q,2 a) Assign E/Z configuration to the following compounds:

(2)

b) Draw the stereoisomers of 2,3 – pentanediol. (3)

Q.3 What is a racemic mixture? How can it be resolved? (5)

Q.4 What is fingerprint region? How is IR spectrum of a compound recorded? (5)

Q.5 What is inductive effect? Give two examples each of the groups having + I and –I effect. (5)

Q.6 a) What is significance of octane and cetane numbers? (2)

b) What is Wurtz reaction? Give its limitations. (3)

Q.7 a) Explain the following:

i) Hydrohalogenation is regiospecific reaction

ii) Addition of halogens to alkene give trans product.

iii) Hydroboration appears to be anti Markownik off addition reaction. (3)

4

b) Complete the following reactions

(2)

Q.8 a) Alkyne is more acidic than alkene. Explain. (2)

b) How would you prepare the following compounds?

i) trans-3- Heptene from 3-heptyne.

ii) Ethenol from ethyne.

iii) 1-Hexyne from ethyne. (3)

Q.9 a) What are the limitations of Frieded-Craft reaction? (2)

b) What is difference between ortho-directing activator and ortho- directing

deactivator? (2)

c) Write the resonance structures of carbocation formed during electrophilic substitution

of naphthalene. (1)

Q.10 a) Write the structure of the following compounds.

i) 1,2-oxazole ; ii) 2-acetylpyrole (2)

b) Complete the following reactions.

(3)

Q. 11 a) Define E1 and E2 reactions and discuss their mechanisms and stereochemistry. (2 ) 2

1

b) How would you explain the high reactivity of allylic and benzylic helides under both

SN1 and SN2 conditions? (2 ) 2

1

Q.12 a) Suggest a synthetic sequence for the preparation of each of the following compounds

from the indicated starting materials:

i) Primary alcohol from Grignand reagent

ii) Trichloromethane from ethanol

iii) Phenol from benzene

iv) Glycerol from propene

v) DMSO from dimethyl sulphide (5)

5

Q.13 Write short note on the following:

i) Aldol Condensation

ii) Haloform reaction (5)

Q.14 How would you explain that epoxides are highly reactive in comparison to other ethers? (5)

Q.15 How will you prepare a carboxylic acid by carbonation of an organometallic reagent?

Illustrate with the help of an example. (5)

Q.16 Write a short note on Strecker synthesis. (5)

Q.17 Explain Hofmann rearrangement. (5)

Q.18 Give the products of reduction of nitrobenzene under different conditions. (5)

Q.19 What is carbylamine reaction? How is it useful? (5)

Q.20 Explain mutarotation by drawing appropriate structures. (5


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