B.Sc-B.Sc Chemistry 2nd Sem Organic and Inorganic Chemistry(University of Pune, Pune-2013)
F.Y. B.Sc.
CHEMISTRY - II
SEAT No. :
[Total No. of Pages : 4
Organic and Inorganic Chemistry
(Paper - II) (2008 Pattern) (Theory)
Time : 3 Hours] [Max. Marks : 80
Instructions to the candidates :
1) All questions are compulsory.
2) Draw neat diagrams wherever necessary.
3) Figures to the right indicate full marks.
Q1) Answer the following questions : [16]
a) Why is staggered conformation more stable than eclipsed conformation?
b) Give applications of organic compounds in our daily life.
c) Ethyl alcohol is water soluble but n-butyl alcohol is water insoluble.
Explain.
d) Maleic acid undergoes cyclisation at low temperature but fumaric acid
does not. Explain.
e) Benzene does not undergoes addition reactions. Explain.
f) What is oxidation number of
i) P in (P2 O7)4–
ii) S in (S4 O6)2–
g) Alkali metals do not show +2 oxidation state. Explain.
h) Draw the structures of following :
i) XeO2F2
ii) [XeO6]4–
Q2) a) Attempt any two of the following : [8]
Discuss the acidic nature of phenol. Give any two reactions of
phenol.
What is Resonance effect? Explain +R and –R effects with suitable examples.
Explain isomerism. Give classification of structural isomerism with examples.
P.T.O.
b) Attempt any two of the following : [8]
What are ethers? How are they classified? Give any two methods
for the preparation of ether.
What is an electrophilic substitution reaction? Explain nitration of benzene.
What is difference between combustion and pyrolysis?
Q3) a) Answer any two of the following : [8]
How is ethyl methyl ether prepared from -
1) Diazomethane
2) Ethyl chloride? What is action of cold HI on it?
What is inductive effect? Chloroacetic acid is stronger acid than acetic acid. Explain.
Assign E and Z configuration of following compounds.
iv) What are alkynes? How will you prepare alkynes starting from
A) Vicinal dihalides.
B) Higher alkynes from acetylene.
b) Attempt any two of the following : [8]
i) What are alkyl halides? How are they classified? How is ethyl
bromide prepared from ethylene?
ii) What is steric effect? Explain with suitable examples.
iii) Write short notes on :
A) Optical activity.
B) Peroxide effect.
Q4) a) Attempt any three of the following : [6]
Draw all possible isomers of the compound having molecular
formula C3H8O.
Define the following :
A) Covalent bond.
B) Intramolecular forces.
Draw the structures for the following compounds.
A) 2 - bromo - 3 - chloro - pentane.
B) 2, 3 - dimethyl butane.
iv) Assign R or S configuration of following compound.
b) Identify the products A and B and rewrite the reactions (any
two) : [4]
c) Attempt any one of the following : [6]
i) Draw the skeleton of the long form of periodic table and show the
position of following in it.
Alkaline earth metal.
Second transition series. Fluorine.
Most electropositive element. d-block elements.
Zero group element.
ii) Explain the diagonal relationship between lithium and magnesium.
[4317]-6 3
Q5) a) Attempt any two of the following : [6]
Calculate the screening constant ‘S’ and Z* for the valence electron
of oxygen (Z = 8).
Give the names and write electronic configuration of group - I A
elements.
Write a note on position of noble gases in the periodic table.
b) Attempt any two of the following : [10]
Discuss the bonding and shape of
A) XeO4
B) XeOF4
What are the application of alkali metals and their compounds?
Describe the separation of alkali metals using crown ethers.
| Earning: Approval pending. |
