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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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The most contributing structure in nitroethene among the following is-

1.  
2.  
3.  
4. 

Subtopic:  Electron Displacement Effects |
 64%
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

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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Hints

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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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

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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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

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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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

If is mixed with NaOH solution. Acid base reaction occurs and HO- snatches H+ from organic molecule. Which carbon will loose H easily?

1. P

2. Q

3. R

4. S

Subtopic:  Acidic & Basic Character |
 55%
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Hints

The correct acidic strength order of acidic hydrogen x, y and z is respectively.

(1) x > z > y

(2) x > y > z

(3) z > y > x

(4) y > z > x

Subtopic:  Acidic & Basic Character |
 51%
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Hints

The correct basic strength order is:

(1) I > II > IV > III

(2) IV > III > II > I

(3) III > II > IV > I

(4) III > IV > II > I

Subtopic:  Acidic & Basic Character |
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The correct order of acid and basic strength for the following pair of compounds should be?

(1) I > II ; III > IV ; V > VI ; VII < VIII

(2) I < II ; III > IV ; V < VI ; VII > VIII

(3) I > II ; III > IV ; V > VI ; VII > VIII

(4) I < II ; III > IV ; V < VI ; VII < VIII

Subtopic:  Acidic & Basic Character |
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints