Which position will be attacked most rapidly by the nitronium ion (-NO₂)⁺ when the compound undergoes nitration with HNO₃/H₂SO₄ :-

1. A

2. B

3. C

4. D

Which of the following substitution of benzene is ortho-para in electrophilic substitution and ortho-para in nucleophilic substitution ?

(1) -NO₂

(2) -NO

(3) -SO₃H

(4) -SO₂Me

Which one of the following undergoes nucleophilic aromatic substitution at the fastest rate?
(1) 

(2) 

(3) 

(4) 

The electrophile. E^$\oplus$ attacks the benzene ring to generate the intermediate $\mathrm{\sigma }$- complex. Of the following which $\mathrm{\sigma }$- complex is of lowest energy?

1. 

2. 

3. 

4. 

Which of the following meta-directing substituents is the most deactivating in aromatic substitution?

Among cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV) the correct order of decreasing acidic character will be:

Following is the list of some aromatic compounds. Select the correct sequence of decreasing order of reactivity for electrophilic aromatic substitution reaction using the answer codes given below:

a. ${\mathrm{C}}_6{\mathrm{H}}_5<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\mathrm{OH}$

b. ${\mathrm{C}}_6{\mathrm{H}}_5<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{CH}}_3$

c. ${\mathrm{C}}_6{\mathrm{H}}_5<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>{\mathrm{NO}}_2$

d. ${\mathrm{C}}_6{\mathrm{H}}_5<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\mathrm{CHO}$

Answer codes :

1. a d b c

2. c d b a 

3. a b d c

4. a b c d

Consider the following statements :

a. ${\mathrm{CH}}_3$ group is o, p-directing group due to hyperconjugation.

b. ${\mathrm{CCl}}_3$ is meta directing group due to reverse hyperconjugation.

c.${\mathrm{CCl}}_3$  group is meta directing group due to mesomeric effect.

d. CHO group is m-directing group 

Of these statements :

1. a and b are correct

2. a and c are correct

3. a, b and d are correct

4. c and d are correct

Arrange the reactivity of given compounds in decreasing order for hydrolysis reaction?

a. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{NH}}_2$

b. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-\mathrm{Cl}$

c. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-\mathrm{O}-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{CH}}_3$

d. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{OC}}_2{\mathrm{H}}_5$

Select the correct answer form the codes given below:

Codes :

1. a b c d

2. b c d a

3. b c a d

4. a d b c

Which alcohol is most reactive for dehydrogenation or dehydration?

1. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{OH}}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2-{\mathrm{NO}}_2$

2. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{OH}}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2-\mathrm{CHO}$

3. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{OH}}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2-\mathrm{CN}$

4. ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{OH}}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2-{\mathrm{COCH}}_3$