General Mechanism of Electrophilic Aromatic Substitution

Q.

Convert Ethyl bromide into Ethane?

Q.

What is the product formed when benzaldehyde and formaldehyde are heated with an aqueous $\mathrm{NaOH}$ solution?

Q.

Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?

Q.

How do you convert aniline to phenol?

Q.

This is Sandmeyer reaction.

Benzene diazonium chloride when reacts with hypophosphorus acid produces

1. Phenol

2. Phenyl isocyanide

3. Benzene

4. Phenyl phosphate

Q.
Among the given species the Resonance stablised carbocations are:

1. (C) and (D) only
2. (A), (B) and (C) only
3. (A) and |(B) only
4. (A), (B) and (D) only

Q.

Can nitrobenzene undergo Friedel Crafts acylation reaction?

Q. Rank the following molecules in increasing order of relative rate of $S_{N}1$ solvolysis with methanol and heat

1. $III<II<IV<V<I$
2. $II<III<IV<I<V$
3. $V<IV<III<II<I$
4. $I<II<III<IV<V$

Q. When ethyl chloride and alcoholic KOH are heated, the compound obtained is

1. $C_2{H}_4$
2. $C_2{H}_2$
3. $C_6{H}_6$
4. $C_2{H}_6$

Q.

What is the difference between elimination and substitution reactions?

Q.

Why Anhydrous ${\mathrm{AlCl}}_3$ is used in Friedel Crafts reaction?

Q. Reaction of phenylacetylene with $dil.H_{2}S{O}_4$ and $HgS{O}_4$ gives

1. acetophenone
2. 2-phenylethenol
3. phenylacetaldehyde
4. phenylacetic acid

Q. Why is i =2 for NaCl even when alpha( degree of dissociation) is 100%? Or i =3 for K2SO4 when alpha is 100% ?

Q.

The compound A in the following reaction is:

1. ${\mathrm{C}}_6{\mathrm{H}}_5-{\mathrm{CH}}_2-\stackrel{\stackrel{\mathrm{O}}{\mathrm{II}}}{\mathrm{C}}-{\mathrm{CH}}_3$

2. ${\mathrm{C}}_6{\mathrm{H}}_5-\stackrel{\stackrel{\mathrm{O}}{\mathrm{II}}}{\mathrm{C}}-{\mathrm{CH}}_3$

3. ${\mathrm{C}}_6{\mathrm{H}}_5-\stackrel{\mathrm{O}}{\stackrel{\mathrm{II}}{\mathrm{C}}}-\underset{\underset{{\mathrm{CH}}_3}{\mathrm{I}}}{\stackrel{\stackrel{{\mathrm{CH}}_3}{\mathrm{I}}}{\mathrm{CH}}}$

4. ${\mathrm{C}}_6{\mathrm{H}}_5-\stackrel{\stackrel{\mathrm{O}}{\mathrm{II}}}{\mathrm{C}}-{\mathrm{CH}}_2{\mathrm{CH}}_3$

Q. 40. In a particular reaction the time required to complete half of the reaction was found to increase 16 times when the initial concentration of the reactant was reduced to one - forth . What is the order of the reaction ?

Q.

Write the balanced chemical equation for the preparation of Ethyne using Calcium carbide

Q. Upon heating an aqueous solution of benzene diazonium salt product obtained is :

1. Phenol
2. nitrobenzene
3. Chlorobenzene
4. Benzene

Q.

In the following compound, the least number of monochlorination is possible in

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$

2. ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\mathrm{CH}}-{\mathrm{CH}}_2{\mathrm{CH}}_3$

3. ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\stackrel{\stackrel{{\mathrm{CH}}_3}{|}}{\mathrm{C}}}-\mathrm{H}$

4. ${\mathrm{CH}}_3-\stackrel{{\mathrm{CH}}_3}{\stackrel{|}{\underset{\underset{{\mathrm{CH}}_3}{|}}{\mathrm{C}}}}-{\mathrm{CH}}_3$

Q. $\left(I\right)Chlorobenzene$ $\left(II\right)2,4-dinitrochlorobenzene$ $\left(III\right)p-nitrochlorobenzene$

The decreasing order of their reactivities towards electrophilic substitution reaction is:

1. $\left(I\right)>\left(III\right)>\left(II\right)$
2. $\left(II\right)>\left(I\right)>\left(III\right)$
3. $\left(I\right)>\left(II\right)>\left(III\right)$
4. $\left(III\right)>\left(I\right)>\left(II\right)$

Q. Which of the following statement is correct regarding the following reaction?

1. Major product is endocyclic alkene formed according to Saytzeff
2. Major product is exocyclic alkene formed according to Saytzeff
3. Major product is exocyclic alkene formed according to Hofmann
4. Major product is endocyclic alkene formed according to Hofmann

Q.

What is the role of benzoyl peroxide in the addition polymerisation of alkenes? Explain its mode of action with the help of an example.

Q. Although chlorine is an electron withdrawing group, yet it is ortho-, para- directing in electrophilic aromatic substitution reaction. Explain why it is so?

Q.

What happens when phenol is treated with ammonia in the presence of anhydrous ZnCl₂?

1. Alkane is formed

2. Aniline is formed

3. Esters are formed

4. Alkyl halide is formed

Q. What is the product formed when benzene diazonium chloride reacts with phenol in an alkaline medium?

1. Azo dye
2. Phenolphthalein
3. Quinol
4. Cyclohexanol

Q.

Which of the following has maximum stability

1. 

2. 

3. 

4. 

Q. Aniline on oxidation with $N{a}_{2}C{r}_2{O}_7$ and $H_{2}S{O}_4$ gives

1. m-amino benzoic acid
2. p-benzoquinone.
3. benzoic acid
4. Schiff’s base

Q. Acetone and acetaldehyde can be distinguished by using_______.

1. $NaHS{O}_3$
2. Grignard reagent
3. ammoniacal $AgN{O}_3$
4. $PC{l}_5$

Q. Aniline can be identified by :

1. Reimer Tiemann reaction
2. Kolbe’s reaction
3. Haloform reaction
4. Carbylamine reaction

Q. Statement-1: Benzene and ethene both react with electrophilic reagents.
Statements-2: Benzene and ethene both have loosely bound π-electrons, which can be donated to the vacant orbital of the electrophile

1. Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for statement-1
2. Statement-1 is true, Statement-2 is true; Statement-2 is NOT a correct explanation for statement-1
3. Statement-1 is true, Statement-2 is false
4. Statement-1 is false, Statement-2 is true

Q. The decreasing order of reactivity towards electrophilic substitution reaction of the following compounds is:
(i) benzene
(ii) chlorobenzene
(iii) nitrobenzene
(iv) toluene

1. $i>iii>iv>ii$
2. $iv>ii>i>iii$
3. $iv>i>iii>ii$
4. $iv>i>ii>iii$