Which of the following is the most correct electron displacement for a nucleophilic reaction to take place? 
 
1.
2.
3.
4.

Subtopic:  Bond Cleavage & Isomerism |
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In Duma's method for estimation of nitrogen, 0.25g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is
1. 17.36
2. 18.20
3. 16.76
4. 15.76

 

Subtopic:  Quantitative Analysis of Organic Compounds |
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Two possible stereo-structures of CH3CHOH.COOH, which are optically active, are called:

1. Diastereomers

2. Atropisomers

3. Enantiomers

4. Mesomers 

Subtopic:  Stereo Isomers |
 76%
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Which of the following statements is not correct for a nucleophile?

1.  Nucleophile is a lewis acid.
2.  Ammonia is a nucleophile.
3.  Nucleophiles attack low electron density sites.
4.  Nucleophiles are not electron-seeking.

Subtopic:  Nucleophile & Electrophile |
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The pair of electron in the given carbanion, CH3C≡C, is present in which orbitals?
1. sp3
2. sp2
3. sp
4. 2p

 

Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
 79%
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The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is
1. The eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain
2. The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain
3. The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
4. The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

 

Subtopic:  Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
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For the following reactions, 

(i) CH3CH2CH2Br + KOHCH3CH=CH2 + KBr + H2
 

(ii) 
 

(iii)  
Which of the following statements is correct?
1. (i) is elimination, reaction, (ii) is substitution and (iii) is addition reaction
2. (i) is elimination, (ii) and (iii) are substitution reactions
3. (i) is substitution, (ii) and (iii) are addition reactions
4. (i) and (ii) are elimination reactions and (iii) is addition reaction

 

Subtopic:  Chemical Properties |
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Which of the following molecules represents the order of hybridisation sp2,sp2,sp,sp from left to right atoms?
1. HCC-CH
2. CH2=CH-CCH
3. CH2=CH-CH=CH2
4. CH2-CH=CH-CH3

 

Subtopic:  Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
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Which of the following carbocations is expected to be most stable?
1. 
2. 
3. 
4. 

 

Subtopic:  Electron Displacement Effects |
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The correct(s) order among the following concerning the –I effect of the substituents:
(R= alkyl)
a. -NH2<-OR<-F
b. -NR2<-OR<-F
c. -NH2>-OR>-F
d. -NR2>-OR>-F
1. Both b and d  2. Both a and c
3. Both a and b 4. Both d and a
Subtopic:  Electron Displacement Effects |
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