Sulphur trioxide act as:

1. An electrophile             

2. A nucleophile

3. A homolytic agent         

4. A base

The correct order of nucleophilicity among the following is:

(I) $C{H}_{3}CO{O}^{-}$

(II) $C{H}_{3}C{O}^{-}$

(III) CN^-

(IV) 

1. I > II > III > IV

2. IV > III > II > I

3. II > III > I > IV

4. III > II > I > IV

The compound which gives the most stable carbocation on dehydration:

$1. C{H}_3-CH-\left(C{H}_3\right)- C{H}_{2}OH$

2. $C{H}_3 -C{\left(C{H}_3\right)}_2- OH$

3. CH₃ - CH₂ - CH₂ - CH₂OH

$4. C{H}_3 -CH\left(OH\right)- C{H}_2 - C{H}_3$

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

Which of the following acids has the smallest dissociation constant?

(1) CH₃CHFCOOH

(2) FCH₂CH₂COOH

(3) BrCH₂CH₂COOH

(4) CH₃CHBrCOOH

Which of the following resonating structures of 1-methoxy-1,3-butadiene is least stable?

1. $\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_2-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\stackrel{\oplus}{\mathrm{O}}-\mathrm{CH}_3$
2. $C H_2=\mathrm{CH}_2-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}=\stackrel{\oplus}{\mathrm{O}}-\mathrm{CH}_3$
3. $\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_2-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}=\mathrm{CH}-\mathrm{O}-\mathrm{CH}_3$
4. $\mathrm{CH}_2=\mathrm{CH}-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{O}-\mathrm{CH}_3$

The least stable resonance structure among the following is:

1. 

2. 

3. 

4. 

Hyperconjugation involves the overlap of the following orbitals:

1. σ - σ

2. σ - p

3. p - p

4. π - π

The IUPAC name of the compound shown below is:

1. 2-bromo-6-chlorocyclohex-1-ene

2. 6-bromo-6-chlorocyclohexene

3. 3-bromo-1-chlorocyclohex-1-ene

4. 1-bromo-3-chlorocyclohexene