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. ${\mathrm{C}}_6{\mathrm{H}}_5 - \mathrm{OH}$

b. ${\mathrm{C}}_6{\mathrm{H}}_5 - {\mathrm{CH}}_3$

c. ${\mathrm{C}}_6{\mathrm{H}}_5 - {\mathrm{NO}}_2$

d. ${\mathrm{C}}_6{\mathrm{H}}_5 - \mathrm{CHO}$

Answer codes :

1. a d b c

2. c d b a 

3. a b d c

4. a b c d

Arrange the decreasing order of reactivity of these compounds for nucleophilic substitution reaction.

a. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{O}-\underset{\underset{\mathrm{O}}{\left|\right|}}{\overset{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{S}}}-{\mathrm{CF}}_3$

b. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{O}-\mathrm{TsCl}$

c. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Cl}$

d. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Br}$

Select the correct answer from the codes given below:

Codes:

1. c, d, a, b

2. c, d, b, a

3. a, b, c, d

4. a, b, d, c

Arrange decreasing order of reactivity of given compounds with NBS/ ${\mathrm{CCl}}_4$/ hv:

a. ${\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{CH}}_3$

b. ${\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

c. ${\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{CH}}_2-\mathrm{CH}={\mathrm{CH}}_2$

d. ${\mathrm{C}}_6{\mathrm{H}}_5-\underset{\underset{{\mathrm{CH}}_3}{|}}{\mathrm{C}}\mathrm{H}-\mathrm{CH}={\mathrm{CH}}_2$

Select the correct answer from the codes given below:

Codes :

1. d c a b

2. d c b a 

3. a b c d

4. a c b d

Consider the following statements:

a. Benzene gives substitution reaction more readily than addition reaction.

b. In benzyne mechanism reaction intermediate is carbanion also.

c. Tertiary alcohol always gives S_N¹ reaction.

d. Reactivity of alcohol is very poor for SN reaction because alcohol is strongly acidic in character.

Of these statements :

1. only a is correct.

2. a and c are correct

3. a, b, and d are correct

4. a, b and c are correct

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

Which among the following is correctly matched?

1. 

2. 

3. 

4. 

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

In which reaction product formation takes place by Saytzeff rule?

1. ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\stackrel{\stackrel{\mathrm{Br}}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_3\stackrel{{\mathrm{CH}}_3\mathrm{ONa}/∆}{\to }$

2. ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\overset{\stackrel{\mathrm{OH}}{|}}{\mathrm{C}}}-{\mathrm{CH}}_3\stackrel{\mathrm{conc}. {\mathrm{H}}_2{\mathrm{SO}}_4/∆}{\to }$

3. ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\overset{\stackrel{\mathrm{Br}}{|}}{\mathrm{C}}}-{\mathrm{CH}}_3\stackrel{\mathrm{alc}. \mathrm{KOH}/∆}{\to }$

4. ${\mathrm{CF}}_3-{\mathrm{CHCl}}_2\stackrel{\mathrm{alc}. \mathrm{KOH}/∆}{\to }$

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

Which among the following compounds has minimum pH value?

1. butane

2. 2-butene

3. 1-butyne

4. 2-butyne