Organic Chemistry -
Chemistry is the study of matter and energy and the interactions between them. It is a physical science that is closely related to physics, which often shares the same definition.This is chemistry blog.here we provide knowledge regarding chemistry.All previous paper regarding CSIR net,GATE,IISC,TIFR.JAM,STET etc.....
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Monday, 30 April 2012
Inorganic Chemistry books link
Inorganic
Chemistry:
Meissler and Tarr
Advanced
Inorganic Chemistry (3rd Edition):
Cotton and Wilkinson
Inorganic
Chemistry,Principles of Structure & Reactivity(4th Ed): Huheey
Huheey
Part1
Huheey
Part2
Huheey
Part3
Wednesday, 18 April 2012
The E2 reaction – Second Order Elimination
1. Does Steric Hinderance affect this reaction?
Ans. Steric hinderance does not
greatly affect E2 reactions. Therefore,
highly substituted carbon chains, which form the most stable alkenes, will
undergo E2 easily.
2. What is the geometry of the intermediate?
Ans. The
intermediate form an anti-periplanar geometry.
3. Why is it called a second order reaction?
4. Can rearrangement occur?
5. What type of base does this reaction favor?
Ans. A strong base
is favored in this reaction because it is better able to remove a proton.
6. What type of substrate works best in this reaction?
Ans. Highly
substituted substrates will work the best in this reaction:3o > 2o
> 1o > methyl
Because a good
base has more difficulty reaching the carbon for substitution
Sunday, 8 April 2012
Questions
1.
Which of the following substances cannot be broken down by ordinary chemical
reactions?
a) water c) carbon dioxide b) gold d) glucose
2. Which of the following substances does not possess uniform composition?
a) pure water b) salt water c) helium gas d) salad
3. Which of the following is made up of only one type of atom?
a) NO b) He c) CO d) MgS
4. Which of the following represents a mixture?
a) NaCl(s) b) NaCl(l) c) NaCl(g) d) NaCl(aq)
5. Which of the following shows a ternary compound?
a) CO b) NaCl c) NH3 d) NaNO2
a) water c) carbon dioxide b) gold d) glucose
2. Which of the following substances does not possess uniform composition?
a) pure water b) salt water c) helium gas d) salad
3. Which of the following is made up of only one type of atom?
a) NO b) He c) CO d) MgS
4. Which of the following represents a mixture?
a) NaCl(s) b) NaCl(l) c) NaCl(g) d) NaCl(aq)
5. Which of the following shows a ternary compound?
a) CO b) NaCl c) NH3 d) NaNO2
Sunday, 1 April 2012
Osmotic Pressure
Q.1 Why
a person suffering from high blood pressure is advised to take minimum quantity
of common salt ?
Ans. Osmotic
pressure is directly proportional to the conc. of solutes. Our body fluid
contain a number of solutes. On taking large amount of salts, ions enter the
body fluid there by raising the conc. of the solutes. As a result osmotic
pressure increases which may rapture the blood cells.
Q. 2 Chloro
acetic acid is a monoprotic acid and has Ka = 1.36 × 10–3. Calculate b. p. of 0.01
M aqueous soln ? (Kb = 0.51 k kg/mol)
Ans. Kb = 0.51
k kg/mol
a = Ka / C
= 1.36 × 10–3 / 0.01
= 0.3687
i = 1 + a
= 1 + 0.3687 = 1.3687
DTb = i × Kb m
= 1.36 × 10–2 × .51
= 0.0069 °C
Q. 3 Which
colligative property is preferred for the molar mass determination of macro
molecules ? Why ?
Ans. Osmotic
pressure is preferred over all other colligative properties because :
(a) even in dil. soln the o. p.values are
appreciably high and can be measured accurately.
(b) o. p.can be measured at room temp. on the
other hand elevation in B. P. is measured at high temp. where the solute may
decompose. The depression in freezing point is measured at low temp.
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