Which of the following statements is not correct?

1. A compound whose molecule has D configuration will always be dextrorotatory

2. A compound whose molecule has D configuration may be dextrorotatory or levorotatory

3. A compound whose molecule has R configuration may be dextrorotatory or levorotatory

4. A compound whose molecule has L configuration may be dextrorotatory or levorotatory

Subtopic:  Stereo Isomers |
 67%
From NCERT
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Choose the correct statement among the following: 

1.  Inductive effect transfers e from one carbon atom to another.
2.   Inductive effect operates in both σ\p bonds.
3.     Inductive effect creates no charge in the molecule.
4.      Inductive effect creates partial charges and it is distance-dependent.

Subtopic:  Electron Displacement Effects |
 86%
From NCERT
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The correct stability order of following species is :

(1) x > Y > w > z

(2) y > x > w > z

(3) x > w > z > y

(4) z > x > y > w

Subtopic:  Electron Displacement Effects |
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Which of the following does not represent the resonating structure of

1. 
2. 
3. 
4. 

Subtopic:  Electron Displacement Effects |
 54%
From NCERT
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Ordinarily the barrier to rotation about a carbon-carbon double bond is quite high but in compound P double bond between two rings was observed by NMR to have a rotational energy barrier of only about 20 cal.\mol., showing that it has lot of single bond charcter. The reason for this is

(1) Double bond having partial triple bond charcter because of resonance

(2) Doule bond undergo flipping

(3) Double bond having very high single bond charcter because of aromaticity gained in both three and five membered rings.

(4) +I effect of nC3H7 groups makes double bond having partial single bond character.

Subtopic:  Electron Displacement Effects |
 66%
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The most contributing structure in nitroethene among the following is-

1.  
2.  
3.  
4. 

Subtopic:  Electron Displacement Effects |
 64%
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In which of the followig molecules all the effects namely inductive, mesomeric and hyperconjugation operate ?

(1) (2) (3) (4)

Subtopic:  Electron Displacement Effects |
 77%
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The acid strength order is:

(1) I > IV > II > III

(2) III > I > II > IV

(3) II > III > I > IV

(4) I > III > II > IV

Subtopic:  Acidic & Basic Character |
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Acid strength of the conjugate acids of the following are-

(1) I > II > III > IV

(2) III > II > I > IV

(3) IV > III > II > I

(4) None of these

Subtopic:  Acidic & Basic Character |
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The acid dissociation constants of the following acids are given as under:

Compound Ka CICH2COOH 136 × 10–5 139 × 10–5 8.9 × 10–5 2.96 × 10–5 CH3CHCH2COOH 1.52 × 10–5 From this data, the following observations can be made. Mark the correct statements for above mentioned compounds.

(i) The above variation in acidities of the above acids are due to inductive effect only.

(ii) The above variation are both due to inductive and resonance effects.

(iii) Inductive effect varies sharply with distance.

(iv) –I effect of chlorine is not much.

(1) i and ii

(2) i and iii

(3) ii and iii

(4) iii and iv

Subtopic:  Electron Displacement Effects |
 66%
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