Nitration of Benzene

Q. Pyridine is less basic than triethylamine because:

1. Pyridine has aromtic character
2. Nitrogen in pyridine is sp${}^2$ hybridised
3. Pyridine is a cyclic system
4. In pyridine, lone pair of nitrogen is delocalised

Q. Consider the nitration of benzene using mixed conc. $H_{2}S{O}_4$ and $HN{O}_3$ . If a large amount of $KHS{O}_4$ is added to the mixture, the rate of nitration will be :

1. Doubled
2. Faster
3. Slower
4. Unchanged

Q.
The major product formed in the reaction is:

1. 
2. 
3. 
4. 

Q. Identify the products (X) and (Y)in the given reaction.

1. X=Acetophenone, Y=m-Nitroacetophenone
2. X=Toluene, Y=m-Nitroacetophenone
3. X=Acetophenone, Y=o-and p-Dinitroacetophenone
4. X=Benzaldehyde, Y=m-Nitroacetophenone

Q. Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A) : –Cl is an o, p-directing group.
Reason (R) : –Cl activates the ring, towards electrophilic substitution reaction.
[0.77 Mark]

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q.

Assertion (A): - $N{O}_2$ group is benzene ring deactivating and m - directing group

Reason (R): - $N{O}_2$ group with draws electron density from benzene ring and makes ortho and para positions more electron deficient than meta position

1. A and R are true and R is the correct explanation of A

2. A and R are true and R is not the correct explanation of A

3. A is true, R is false

4. A is false but R is true

Q. (i) What is the major mononitration product of $Ph-COO-Ph$ when it is reacted in a nitrating mixture?
(ii) Which of the following are formed when $Ph-COOH$ reacts with $C{H}_{3}MgI$ ?

1. (i) $Ph-COO-Ph-N{O}_2$ - ortho product
   (ii) Phenol
2. (i) $Ph-COO-Ph-N{O}_2$ - para product
   (ii) Benzene
3. (i) $Ph-COO-Ph-N{O}_2$ - para product
   (ii) $Ph-C{H}_3$
4. (i) $Ph-COO-Ph-N{O}_2$ - ortho product
   (ii) Methane

Q.

In the nitration of benzene using a mixture of conc. H₂SO₄ and conc. HNO₃ the Species which initiates the reaction is_______________

1. NO⁺

2. NO₂⁺

3. NO₂^-

4. NO₂

Q. Which of the following carbocations is expected to be most stable?

1. 
2. 
3. 
4. 

Q.

In the nitration of benzene using a mixture of conc. H₂SO₄ and conc. HNO₃ the Species which initiates the reaction is_______________

1. NO₂

2. NO⁺

3. NO₂⁺

4. NO₂^-

Q. In nitration of benzene

1. $H_2{\mathrm{SO}}_4\mathrm{protonates}{\mathrm{HNO}}_3$
2. ${\mathrm{HNO}}_3\mathrm{protonates}{H}_2{\mathrm{SO}}_4$
3. $H_2{\mathrm{SO}}_4\mathrm{protonate}\mathrm{benzene}$
4. ${\mathrm{HNO}}_3\mathrm{protonates}\mathrm{benzene}$

Q. Correct statement about the given chemical reaction is :

1. The reaction will form sulpnonated product instead of nitration.
2. $-\ddot{N}{H}_2$ group is ortho and para directive so product (B) is not possible
3. Reaction is possible and compound (B) will be the major product.
4. Reaction is possible and compound (A) will be major product.

Q. What is the substitution reaction? Write the reaction of chlorine with methane?

Q. Assertion :Benzene gives chlorobenzene when reacted with acetyl chloride. Reason: chlorination of benzene is an electrophilic substitution.

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. For the identification of $\beta$-naphthol using dye test, it is necessary to use:

1. dichloromethane solution of $\beta$-naphthol
2. acidic solution of $\beta$-naphthol
3. neutral solution of $\beta$-naphthol
4. alkaline solution of $\beta$ -naphthol

Q. The order of decreasing reactivity towards electrophilic reagent for the following given compounds is:
a) benzene
b) toluene
c) chlorobenzene
d) phenol

1. d > c > b > a
2. b > d > a > c
3. d > b > a > c
4. a > b > c > d

Q. What are the constituent amines formed when the mixture of (i) and (ii) undergoes Hoffmann bromamide degradation?

1. $Ph(o-D)N{H}_2$ $Ph(o-D)\stackrel{15}{N}{H}_2$
   $PhN{H}_2$ $Ph\stackrel{15}{N}{H}_2$
2. $Ph(o-D)N{H}_2$ $Ph\stackrel{15}{N}{H}_2$
3. $Ph(o-D)\stackrel{15}{N}{H}_2$ $Ph\stackrel{15}{N}{H}_2$
4. $Ph\stackrel{15}{N}HD$ $PhN{H}_2$

Q. Which of the following carbocations is expected to be most stable?

1. 
2. 
3. 
4. 

Q. Assertion :Alkyl halides are colourless when pure. Reason: Bromides and Iodides develop colour when exposed to light.

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. Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds

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

Q. Statement 1 : Bromine is a stronger oxidizing agent than chlorine.
Statement 2: It has a large atomic radius.

1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

3. Statement 1 is correct but Statement 2 is not correct.

4. Statement 1 is not correct but Statement 2 is correct.

5. Both the Statement 1 and Statement 2 are not correct.

Q. You are given three unlabeled test tubes. One test tube contains a solution of ${Na}_2{SO}_4$, the second contains a solution of ${NaHSO}_3$ and the other contains $NaHS{O}_4$.
Describe how you could identify the solutions.

1. Color change
2. Odour test
3. pH measurement
4. Precipitate formation

Q. $N{H}_3$ has much higher boiling point than $P{H}_3$ because :

1. $N{H}_3$ has much higher molecular mass.
2. $N{H}_3$ forms hydrogen bonds.
3. $N{H}_3$ contains ionic bonds while $P{H}_3$ contains covalent bonds.
4. $N{H}_3$ undergoes umbrella inversion.

Q.

Q.
Compound A is:

Q. $Ph-C{H}_3\stackrel{Cr{O}_{2}C{l}_2}{\to }\left(A\right)\stackrel{conc.KOH}{\to }Rh-C{H}_{2}OH+\left(B\right)$. Product (B) of given the reaction is?

1. $Ph-CHO$
2. $Ph-C{O}_{2}H$
3. $Ph-C{O}_2^{-}$
4. $Ph-C{H}_3$

Q. (i) What is the major mononitration product of $Ph-COO-Ph$ when it is reacted in a nitrating mixture?
(ii) Which of the following are formed when $Ph-COOH$ reacts with $C{H}_{3}MgI$ ?

1. (i) $Ph-COO-Ph-N{O}_2$ - ortho product
   (ii) Phenol
2. (i) $Ph-COO-Ph-N{O}_2$ - para product
   (ii) Benzene
3. (i) $Ph-COO-Ph-N{O}_2$ - para product
   (ii) $Ph-C{H}_3$
4. (i) $Ph-COO-Ph-N{O}_2$ - ortho product
   (ii) Methane

Q. Arenium ion formed during the nitration of benzene is stabilised by hyperconjugation.

1. True
2. False

Q. $Ph-C{H}_2-C\equiv N\stackrel{LDA}{\underset{THF}{\to }}\stackrel{C{H}_{3}I}{\to }71\%$; End product of the reaction will be.

1. $Ph-C{H}_2-C{H}_2-N{H}_2$
2. $Ph-C{H}_2-N{H}_2$
3. $Ph-CH=C=N-C{H}_3$
4. $Ph-\underset{C{H}_3}{\underset{|}{C}}H-C\equiv N$

Q. The correct order of activation of benzene ring towards an electrophile is :

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