Electrophilic Substitution Reaction

Q.

Explain how does the -OH group attached to a carbon of benzene ring activate it towards electrophilic substitution?

Q.

Explain the fact that in aryl alkyl ethers
The alkoxy group activates the benzene ring towards electrophilic substitution.

It directs the incoming substituents to ortho and para positions in benzene ring.

Q.

Which one of the following compounds will be most easily attacked by an electrophile?

1. 

2. 

3. 

4. 

Q.

Among the following compounds the decreasing order of reactivity towards electrophilic substitution is

1. II > I > III > IV

2. III > I > II > IV

3. IV > I > II > III

4. I > II > III > IV

Q. State how the following conversions can be carried out :
(ii) Ethyl chloride to Ethene

Q. Reaction of ethyl bromide and silver acetate gives -

1. Ethyl ethanoate
2. Methyl ethanoate
3. Ethanoic anhydride
4. 2-Butanone

Q. The decreasing order of reactivities of the following compounds towards electrophilic substitution is:

1. $I>II>III>IV$
2. $II>I>III>IV$
3. $IV>I>II>III$
4. $III>I>II>IV$

Q. Predict the product for the following elimination reaction.

1. 
2. 
3. 
4. 

Q. Major product of the given elimination reaction is:

1. 
2. 
3. 
4. 

Q. Which of the following aldehydes can produce $1^o$ alcohols when treated with Grignard reagent?

1. Methanal
2. Ethanal
3. Propanal
4. Butanal

Q. Arrange the following species in decreasing order, towards electrophilic addition reaction:
(I) $P{h}_{2}C=C{H}_2$
(II) Ph-CH = CHPh
(III) Ph-CH = CHMe

1. I > III > II
2. I = II> III
3. III > II > I
4. I > II> III

Q.

Dehydrohalogenation of an alkyl halide is a/an?

1. Elimination reaction

2. Both nucleophilic substitution and elimination reaction

3. Rearrangement

4. Nucleophilic substitution reaction

Q. Which of the following is a method of preparing a primary alcohol ?

1. Reduction of ketone
2. Hydrolysis of the adduct obtained from a Grignard reagent and ethanal
3. Oxidative alkaline hydrolysis of adduct obtained from an alkene and borane
4. Hydrolysis of adduct obtained from a Grignard Reagent and a ketone

Q.

The most common type of reaction in aromatic compounds is?

1. Addition reaction

2. Elimination reaction

3. Electrophilic substitution reaction

4. Rearrangement reaction

Q. Consider the following reaction sequence and find the structure of the final product.

1. 
2. 
3. 
4. 

Q. Assertion :Phenol is more reactive than benzene towards electrophilic substitution reaction. Reason: In case of phenol, the intermediate carbocation is more resonance stabilised

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Among the following, which is less reactive towards electrophilic substitution reactions?

1. Benzene
2. Aniline
3. Nitrobenzene
4. Toluene

Q. Elimination reaction in the presence of KOH of $2$-Bromo-pentane to form pent-$2$-ene is :
(a) $\beta$-Elimination reaction
(b) Follows Zaitsev rule
(c) Dehyrohalogenation reaction
(d) Addition reaction

1. (b), (c), (d)
2. (a), (b), (d)
3. (a), (b), (c)
4. (a), (c), (d)

Q. Refer the given reactions and answer the following questions; identify X, Y and Z respectively:

1. $C{H}_{3}COOH,C{H}_2=C{H}_2,C{H}_{3}COOC{H}_3$
2. $C{H}_2=C{H}_2,C{H}_{3}COOH,C{H}_{3}COOC{H}_{2}C{H}_3$
3. $HCHO,C{H}_{3}C{H}_3,C{H}_{2}COOH$
4. $C{H}_{3}C{H}_3,HCHO,C{H}_{3}COOH$

Q. Consider the following sequence of reactions.
The products $\left(A\right)$ and $\left(B\right)$ are :

1. 
2. 
   
3. 
   
4. 
   

Q.

Explain how does the −OH group attached to a carbon of benzene ring activate it towards electrophilic substitution?

Q. What is the product of the reaction shown?

1. I
2. II
3. III
4. IV

Q. Which of the following is a elimination reaction?

1. 
2. 
3. 
4. None of the above

Q. Which of the following compound(s) will undergo Ei elimination reaction?

1. Only III
2. Only (I) and (III)
3. Only (I) and (II)
4. (I), (II) and (III)

Q.

Why cannot aromatic primary amines be prepared by Gabriel phthalimide synthesis?

Q. What is the major product of following reaction?
\( C _{2} H _{5} O ^{-} \)

Q. The correct statement(s) regarding above reaction is/are

1. Final product is given as
2. The reaction is reversible in nature
3. The product is cyclic ketal
4. Product react with base to give back reactant

Q. The ($-OH$) group attached to a carbon of benzene ring _________ it towards electrophilic substitution.

1. has no effect on
2. activates
3. deactivates
4. sometimes activates and sometimes deactivates

Q. Which of the following aldehydes can produce $1^o$ alcohols when treated with Grignard reagent?

1. Methanal
2. Ethanal
3. Propanal
4. Butanal

Q. How many of the given compounds are more reactive than benzene towards electrophilic substitution reaction?