To which ring size cycloalkanes, Baeyer’s strain theory is not valid?

(1) 3 carbon

(2) 4 carbon

(3) 5 carbon

(4) ≥6 carbon

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 68%
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Shifting of electrons of a multiple bonds under the influence of a reagent is called:

(1) I-effect

(2) E-effect

(3) M-effect

(4) T-effect

Subtopic:  Electron Displacement Effects |
From NCERT
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The correct statement among the following is -

1. Allyl carbocation (CH2=CH-CH2+) is more stable than propyl carbocation

2. Propyl carbocation is more stable than allyl carbocation

3. Both are equally stable

4. None of the above

Subtopic:  Reaction Intermediates ; Preparation & Properties |
 68%
From NCERT
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Sulphur trioxide act as:

1. An electrophile             

2. A nucleophile

3. A homolytic agent         

4. A base

Subtopic:  Nucleophile & Electrophile |
 59%
From NCERT
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The correct order of nucleophilicity among the following is:

(I) CH3COO-

(II) CH3CO-

(III) CN-

(IV) 

1. I > II > III > IV

2. IV > III > II > I

3. II > III > I > IV

4. III > II > I > IV

Subtopic:  Nucleophile & Electrophile |
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The compound which gives the most stable carbocation on dehydration:

1. CH3-CH-(CH3)- CH2OH
           

2. CH3 -C(CH3)2- OH

3. CH- CH- CH- CH2OH

4. CH3 -CH(OH)- CH2 - CH3

Subtopic:  Reaction Intermediates ; Preparation & Properties |
 71%
From NCERT
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Allyl isocyanide has:

1. 9 σ, and 4π-bonds.

2. 8 σ, and 5π-bonds

3. 9 σ, and 3π-bonds, 

4. 8 σ, and 3 π bonds

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 66%
From NCERT
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Which of the following acids has the smallest dissociation constant?

(1) CH3CHFCOOH

(2) FCH2CH2COOH

(3) BrCH2CH2COOH

(4) CH3CHBrCOOH

Subtopic:  Acidic & Basic Character |
 63%
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Which of the following resonating structures of 1-methoxy-1,3-butadiene is least stable ?

(1) C⊝H2 -CH=CH-CH=O⊕-CH3

(2) CH2=CH-C⊝H-CH=O⊕-CH3

(3) C⊝H2-C⊕H-CH=CH-O-CH3

(4) CH2=CH-C⊝H-C⊕H-O-CH3

Subtopic:  Electron Displacement Effects |
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The least stable resonance structure among the following is:

1. 

2. 

3. 

4. 

Subtopic:  Electron Displacement Effects |
From NCERT
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