Which of the following compounds undergoes bromination of its aromatic ring (electrophilic aromatic substitution) at the fastest rate?

1.		2.
3.		4.

1. ${\mathrm{Cl}}^{\oplus }$

2. Cl^-

3. Cl

4. Cl²⁺

(A) C₈H₁₀ $\stackrel{{\mathrm{KMnO}}_4}{\to }$ (B)  C₈H₆O₄$\underset{\mathrm{Fe}}{\overset{{\mathrm{Br}}_2}{\to }}$  C₈H₅BrO₄  (C)  (one-product only)

The structure of A in the above-mentioned reaction is:

1.		2.
3.		4.

The product (B) in the above-mentioned reaction is:

1.		2.
3.		4.

Cyclopentadiene is much more acidic than cyclopentane, because:

 The compounds among the following that can be generated by Friedel craft acylation is/are:

I.
II.
III.
IV.

The major product obtained in the given reaction is:

1.		2.
3.		4.

The deactivating but ortho-para directing benzene ring substituent among the following is:

1. -N=O

2. -OCH₃

3. -COCH₃

4. -NO₂

The compound X in the above reaction is:

1.		2.
3.		4.

The oxidation of benzene by V₂O₅ in the presence of air produces: