CSIR-NET Dec-2015 q3

The oxidizing power of [CrO4]^2- , [MnO4]^2- , and [FeO4]^2- follows the order
(1.) [CrO4]^2- < [MnO4]^2- < [FeO4]^2-
(2.) [FeO4]^2- < [MnO4]^2- < [CrO4]^2-
(3.) [MnO4]^2- < [FeO4]^2- < [CrO4]^2-
(4.) [CrO4]^2- < [FeO4]^2- < [MnO4]^2-

Soln (1) 

The more an element is electronegative, the higher will be is oxidizing power. More electronegative is Fe (26), followed by Mn (25) and then Cr (24), so the order for the oxidizing power of those elements : Fe>Mn>Cr. 
Since oxidation number is same (VI) in all three metals.
[CrO4]^2- < [MnO4]^2- < [FeO4]^2-
Reference https://www.physicsforums.com/threads/a-problem-about-oxdizing-power.827918/

CSIR-NET Dec-2015 q2

Deoxy – Hemocyanin is
(1.) heme protein and paramagnetic
(2.) Colorless and diamagnetic
(3.) O2 transport and paramagnetic
(4.) Blue colored and diamagnetic

Soln (2)
colorless Cu(I) deoxygenated form = d¹⁰ configuration (diamagnetic)

the blue Cu(II) oxygenated form.

Reference-
Hemocyanins (also spelled haemocyanins and abbreviated Hc) are proteins that transport oxygen throughout the bodies of some invertebrate animals. These metalloproteins contain two copper atoms that reversibly bind a single oxygen molecule (O2). They are second only to hemoglobin in frequency of use as an oxygen transport molecule. Unlike the hemoglobin in red blood cells found in vertebrates, hemocyanins are not bound to blood cells but are instead suspended directly in the hemolymph. Oxygenation causes a color change between the colorless Cu(I) deoxygenated form and the blue Cu(II) oxygenated form.
Coates CJ, Nairn J (July 2014). "Diverse immune functions of hemocyanins". Dev. Comp. Immunol. 45 (1): 43–55.doi:10.1016/j.dci.2014.01.021. PMID 24486681.

CSIR-NET Dec-2015 q1

The biological functions of the cytochrome P₄₅₀ and myoglobin are, respectively 
(1.) Oxidation of alkene and O₂ storage 
(2.) O₂ transport and O₂ storage 
(3.) O2 storage and electron carrier 
(4.) Electron carrier and O₂ transport 

Soln 
(1) Oxidation of alkene (aliphatic)
The most common reaction catalyzed by cytochromes P₄₅₀ is a monooxygenase reaction, e.g., insertion of one atom of oxygen into the aliphatic position of an organic substrate (RH) while the other oxygen atom is reduced to water:

RH + O₂ + NADPH + H+ → ROH + H2O + NADP+

(Retrieved from https://en.wikipedia.org/wiki/Cytochrome_P450)

(2) O_{2 storage}
Myoglobin (symbol Mb or MB) is an iron- and oxygen-binding protein found in the muscle tissue of vertebrates in general and in almost all mammals. It is related to hemoglobin, which is the iron- and oxygen-binding protein in blood, specifically in the red blood cells.
Nelson DL, Cox MM (2000). Lehninger Principles of Biochemistry (3rd ed.). New York: Worth Publishers. p. 206.ISBN 0-7167-6203-X. (Google books link is the 2008 edition)

Compounds Containing Nitrogen: Quiz 1

Compounds Containing Nitrogen: Quiz 1

• Q1 - Which of the following is not used for nitration of organic compounds

  A - A mixture of concentrated HNO₃ and concentrated H₂SO₄
  B - A mixture of concentrated HNO₃ and acetic anhydride
  C - Fuming nitric acid and concentrated sulphuric acid
  D - Alcoholic potassium nitrate
  

• Q2 -

  2
  1
  3
  4
  

• Q3 - p-nitrotoluene cannot be obtained by:

  A -
  B -
  C -
  D -
  

• Q4 -

  2
  1
  3
  4
  

• Q5 - Examine the following two structures for the anilinium ion and choose the correct statement from the ones given below:

  
  
  A - II is not acceptable as canonical structure because carbonium ions are less stable than ammonium ions
  B - II is not acceptable as canonical structure because it is non-aromatic
  C - II is not acceptable as canonical structure because in it N has 10 valence electrons
  D - II is an acceptable canonical structure
  

• Q6 -

  2
  1
  3
  4
  

• Q7 - Aromatic diazonium group can be replaced by various groups/atoms. In this context, match list I with list III and select the correct answer using the combinations given below the list

  
  
  Combination
  A - A4; B3; C2; D4
  B - A1; B4; C2; D3
  C - A1; B2; C3; D4
  D - A2; B3; C4; D1
  

• Q8 -

  2
  1
  3
  4
  

• Q9 - Which of the following reaction is not feasible?

  A -
  B -
  C -
  D -
  

• Q10

  A -
  B -
  C -
  D -
  

• Q11 The product obtained in the reaction :

  
  
  A -
  B -
  C -
  D - There is no reaction
  

• Q12 -

  A -
  B -
  C -
  D -
  

• Q13 - The reaction of CH₃(CH₂)₆Br with NaNO₂ in the presence of dimethylformamide gives

  A - CH₃(CH₂)₆OH
  B - CH₃(CH₂)₆NO₂
  C - CH₃(CH₂)₆NO
  D - There is no reaction
  

• Q14 -

  A -
  B -
  C -
  D -
  

• Q15 - Which of the following statement is not correct?

  A - Primary amines show intermolecular hydrogen bonding
  B - Secondary amines show intermolecular hydrogen bonding
  C - Tertiary amines show intermolecular hydrogen bonding
  D - Amines have lower boiling points as compared to those of alcohols and carboxylic acids of comparable molar masses
  

• Q16 -

  A -
  B -
  C -
  D -
  

• Q17 - The product not obtained in the reaction:

  CH₃-NO₂ + Cl₂ + NaOH ----->
  
  A - ClCH₂NO₂
  B - Cl₂CHNO₂
  C - Cl₃CNO₂
  D - CH₃NH₂
  

• Q18 -

  A -
  B -
  C -
  D -
  

• Q19 - Treatment of nitrobenzene with acetyl chloride in the presence of anhydrous AlCl₃ gives:

  A - 2-nitroacetophenone
  B - 3-nitroacetophenone
  C - 4-nitroacetophenone
  D - none of these
  

• Q20

  A -
  B -
  C -
  D -
  

score =

CSIR NET – 2012 Q: 143

CSIR NET – 12

Q: 143 – The osazone A could be obtained from –

                 A)    Glucose and mannose                      B)           Mannose and galactose

                 C)     Gulose and fructose                        D)     Galactose and fructose

Answer : A) Glucose and mannose

TABLE OF ATOMIC WEIGHTS

Chemical Symbols : An element is represented by a symbol which is “the first letter” or “the first letter and another letter” of its English or Latin name. The symbol of Hydrogen is H, the first letter of English name; the symbol of Copper is Cu (from Latin name Cuprum).

ORGANIC CHEMISTRY SYLLABUS FOR NET, SET, GATE AND MPSC COMPETITIVE EXAMS

 CSIR – NET

ORGANIC CHEMISTRY

1. IUPAC nomenclature of organic compounds. 2. Principles of stereochemistry, conformational analysis, isomerism and chirality. 3. Reactive intermediates and organic reaction mechanisms. 4. Concepts of aromaticity. 5. Pericyclic reactions. 6. Named reactions. 7. Transformations and rearrangements. 8. Principles and applications of organic photochemistry. Free radical reactions. 9. Reactions involving nucleophotic carbon intermediates. 10. Oxidation and reduction of functional groups.