Sulphonation of Aromatics

Q. Which one of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

1. $C{H}_{3}CH\left(OH\right)C{H}_3$
2. $C{H}_{3}C{H}_{2}CH\left(OH\right)C{H}_3$
3. $C{H}_{3}OH$
4. $C{H}_{3}C{H}_{2}OH$

Q. Arrange the following in the increasing order of reactivity towards sulphonation with fuming sulphuric acid:
Benzene, toluene, methoxybenzene, chlorobenzene.

1. Chlorobenzene < Benzene < Toluene < Methoxy benzene.
2. Toluene < Methoxy benzene<Chlorobenzene < Benzene
3. Toluene < Methoxy benzene<Chlorobenzene < Benzene
4. Chlorobenzene < TolueneBenzene < Methoxy benzene.

Q. Why sulphonation of benzene shows kinetic isotopic effect?

Q.

The major products of the following reactions

1. 

2. 

3. 

4. 

Q. Which of the following is active species in sulphonation of benzene?

1. $S{O}_3$
2. $S{O}_3^{+}$
3. $S{O}_3^{-}$
4. $HS{O}_4^{+}$

Q. What is/are the required reagent for the following reaction:

1. $H_{2}S{O}_4$
2. $S{O}_3$ and $H_{2}S{O}_4$ (fuming)
3. $S{O}_3$
4. All of the above.

Q. What is/are the required reagent for the following reaction:

1. $H_{2}S{O}_4$
2. $S{O}_3$ and $H_{2}S{O}_4$ (fuming)
3. $S{O}_3$
4. All of the above.

Q. Arrange the following compounds in increasing order of reactivity towards nucleophilic substitution :

Q. The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is:

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

Q. Explain sulphonation of benzene with reaction.

Q. Which of the following can be separated by usingsodium bisulphite?(1) Acetaldehyde and Benzaldehyde(2) Acetone and Acetaldehyde(3) Pentan-2-one and Pentan-3-one(4) All of these

Q. Arrange according to boiling point 2, 2dimethylbutane. , 2, 3dimethylbutane. , 3methylpentane. , 2methylpentane

Q. The increasing order of the rate of reaction with $HN{O}_3/H_{2}S{O}_4$:

1. $iii<ii<i$
2. $ii<iii<i$
3. $i<iii<ii$
4. $i<ii<iii$

Q. How many group are $o/p$ director in the electrophilic aromatic substitution?

Q. Arrange the following compound in decreasing order of rate of electrophilic aromatic substitution reaction.

1. (I) > (III) > (II) > (IV)
2. (III) > (I) > (II) > (IV)
3. (I) > (II) > (III) > (IV)
4. (I) > (IV) > (II) > (III)

Q. Identify the position where E.A.S. will take place.

1. a
2. b
3. c
4. All the position are identical

Q. when toluene reacts with Br_2/hv only one H from CH_3 group is replaced by Br , but when Cl_2/hv reacts then 2 H are replaced , pl explain the reason in detai

Q. In the following reaction , $B$ is

1. salicylic acid
2. 2, 4, 6-tribromoaniline
3. phenol
4. benzoic acid

Q. In which of the following, nitration will take place at m - position?

1. I, III & IV
2. II, III & IV
3. I, II & III
4. I only

Q. 29. How to find reactivity of benzene compounds towards electrophilic substitution ?

Q. Among the following, the compound that can be most readily sulphonated is:

1. benzene
2. nitrobenzene
3. toluene
4. chlorobenzene

Q. Identify unknown compounds.

1. $A\to$ Nitrobenzene $B\to$ Dinitrobenzene. $C\to p$ Bromoaniline
2. $A\to C_6{H}_{5}S{O}_{3}H,B\to m$, Benzenesulphonic acid $C\to m$. Benzenesulphonate
3. $A\to C_6{H}_{5}N{O}_2,B\to$ Bromonitrobenzene $C\to$ Bromoaniline
4. $A\to p$; Nitrobenzene $B\to m$ Trinitrobenzene $C\to m$ Bromoaniline

Q. Increasing order of the following for the electrophilic substitution reaction as:-

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

Q. Which of the following is used as a solvent in the Friedel-Crafts reaction ?

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

Q. In the protonation of an alkene, the electrophile is ... and nucleophile is ....

Q. Replacement of $-H$ group by $-S{O}_{3}H$ group in an arene via electrophilic aromatic substitution is called sulphonation.

1. False
2. True

Q. Which is the major product of the sulphonation of chlorobenzene?

1. 
2. 
3. 
4. 

Q. Which pair is usually required for a nucleophilic aromatic substitution reaction ?

1. An aryl halide with an $-N{O}_2$ and a strong nucleophile.
2. $Ar-N{O}_2$ substitution and a strong electrophile.
3. An unsubstituted benzene ring and a strong electrophile.
4. A ring bearing a strong activating group and a strong acid.

Q. Assertion :Toluene in presence of UV rays forms benzaldehyde. Reason: Dichlorotoluene is formed as an intermediate.

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. Both Assertion and Reason are incorrect

Q. Assertion :Benzene on heating with conc. $H_2{SO}_4$ gives benzenesulphonic acid which when heated with superheated steam under pressure gives benzene. Reason: Sulphonation is a reversible process.

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. Both Assertion and Reason are incorrect