Activation of Benzene Ring

Q. The most and least reactive electrophiles in $S_{N}1$ reaction are respectively :

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

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

1. 
2. 
3. 
4. 

Q. The given product cannot be formed by which set of reactants in the presence of $AlC{l}_3$ catalyst?

1. 
2. 
3. 
4. All of these

Q. Which of the following is the most reactive in Friedel craft acylation reaction?

1. 
2. 
3. 
4. 

Q.

The order of decreasing reactivity towards an electrophilic reagent for the following

I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol

1. I > II > III > IV

2. II > IV > I > III

3. IV > II > I > III

4. IV > II > II > I

Q.

How do you add $\mathrm{F}$ to Benzene?

Q. For a particular nucleophillic substitution reaction, if the rate of reactants were found in the order $RI>RBr>RCl>RF$, then the reaction could be:

1. $S_{N}1$ only
2. $S_{N}2$ only
3. either $S_{N}1$ or $S_{N}2$
4. neither $S_{N}1$ nor $S_{N}2$

Q. Which of the following step(s) is/are involved in the mechanism of Kolbe’s reaction?

1. Formation of phenoxide
2. Attack of electrophile
3. Protonation
4. All of the above.

Q. The strong reducing agent is:

1. $Bi{H}_3$
2. $P{H}_3$
3. $N{H}_3$
4. $As{H}_3$

Q. Assertion :In the above reaction a greater regioselectivity is achieved if disiamylbrorane is used in place of diborane Reason: Bulkiness of disiamyl borane increases the regioselectivity

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. Predict the product of the given reaction and find out the degree of unsaturation in the structure of the product.

Q. Nitrobenzene is used as a solvent for Friedel-crafts alkylation of bromo benzene because

1. Nitrobenzene is less reactive than bromobenzene
2. Nitrobenzene is more reactive than bromobenzene
3. Nitrobezene cannot be used in alkylation
4. None of the above

Q. Find the final product.

Q. Identify the product.

Q. Why is NH_4^{+ }considered as group 0

Q. Assertion :Blue colour of $CuS{O}_4$ solution is discharged slowly when an iron rod is dipped into it. Reason: Iron is above copper in electrochemical series.

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. In the following sequence of reaction how many nucleophilic substitution taking place.

Q. Arrange the following compounds in increasing reactivity with $C{H}_{3}ONa$ :

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

Q. CH3-CH=CH2+HCl-->X. What is X in the reaction

Q.

The order of decreasing reactivity towards an electrophilic reagent for the following

I. Benzene II. Toulene III. Chloro benzoic acid IV.Phenol

1. IV > II > I > III

2. I > II > III > IV

3. II > IV > I > III

4. IV > II > II > I

Q. After completing the chemical reactions, write down to which category they belong.

Q. Assertion :p-Nitrophenol gives more electrophilic substituted compound than m-methoxyphenol. Reason: Methoxy group shows only negative I-effect.

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. Arrange the following according to the instructions given in brackets :
$M{g}^{2+},C{u}^{2+},N{a}^{1+},H^{1+}$ (In the order of preferential discharge at the cathode)