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F.M: 35
Department of Chemistry
Bachelor of Science Examination 2015
Semester-IV (Back log)
Subject - Organic Chemistryrll (Paper: CED-S)
Time: 2 hrs
Unil-I
Attempt all qaestions:
1.
(a) Write the order of basicity, thermal stability and reducing character of hydrides
group 15 with proper explanation.
of
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(b) Justifu the group trend of the decomposition temperatures of group 2 carbonates.
[5]
(c)\Mhy borazine is called inorganic benzene? Explain with reasons.
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Unit 2
2 (a) Explain why all the Bronsted
bases are Lewis bases
but all Bronsted acids are not
Lewis acids.
t21
(b) What are disproportionation reactions? Give the overall reaction of disproportionation
of
hydrogen peroxide in presence of catalyst giving the relevant half reactions.
U+2]
(c) Give the Nemst equation for MnO+-/JvIn*2 couple.
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(d) Arrange the following in increasing order of their acidic strength with reason.
XeF6, XeFa,
XeOFa, XeOa, XeFz.
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(e) Arrange the following in increasing order of their acidic strength with reason. (i)
HNO3,
HPO3, HAsO:
(ii) HCIO2, HCIO3, HCIO4.
[1+l]
Unil-3
3 (a) Briefly account the extraction, purification and uses of ultrapure Si
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(b) How is KzCrzOz manufactured?
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(c) What happens when copper rod is dipped in AgNO3 Solution?
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