Quiz- Electrophillic aromatic substitution

Electrophilic Aromatic Substitution Quiz

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Test your knowledge on Electrophilic Aromatic Substitution for JEE and NEET.

1. What is the key feature of an Electrophilic Aromatic Substitution (EAS) reaction?

• An electrophile substitutes a hydrogen atom on an aromatic ring.
• A nucleophile adds to an aromatic ring.
• An electrophile adds to an aromatic ring.
• A nucleophile substitutes a hydrogen atom on an aromatic ring.

2. The intermediate formed during an EAS reaction is known as:

• Carbanion
• Resonance hybrid
• Carbocation
• Arenium ion or sigma complex

3. What is the role of a Lewis acid catalyst in Friedel-Crafts alkylation?

• To act as a nucleophile.
• To stabilize the carbocation intermediate.
• To generate a stronger electrophile.
• To provide a hydrogen atom for substitution.

4. Which of the following is a strongly deactivating group and a meta-director?

• $-OH$
• $-NH_2$
• $-NO_2$
• $-CH_3$

5. The nitrating mixture used for the nitration of benzene is:

• Dilute $H_2SO_4$ and $HNO_3$
• Concentrated $H_2SO_4$ and $HNO_3$
• Anhydrous $AlCl_3$ and $CH_3Cl$
• Fe and $Br_2$

6. Which of the following groups is an ortho, para-director?

• $-CN$
• $-COOH$
• $-OCH_3$
• $-SO_3H$

7. Halogens are deactivating but are also ortho, para-directors. Why?

• Because they exhibit a strong inductive effect.
• Because they exhibit a strong resonance effect.
• Because their inductive effect is stronger than their resonance effect, but the resonance effect directs to ortho/para positions.
• Because they have a positive inductive effect.

8. Which of the following is the most reactive towards EAS?

• Nitrobenzene
• Chlorobenzene
• Toluene
• Benzene

9. The electrophile in the sulfonation of benzene is:

• $SO_3H^+$
• $SO_3$
• $SO_2^+$
• $H_2SO_4$

10. What is the main product of the reaction between toluene and a mixture of concentrated $HNO_3$ and $H_2SO_4$?

• o-nitrotoluene
• m-nitrotoluene
• p-nitrotoluene
• A mixture of o- and p-nitrotoluene.

11. Which of the following is a strongly activating group?

• $-COOH$
• $-CN$
• $-OCH_3$
• $-NH_2$

12. What is the product of Friedel-Crafts acylation of benzene with acetyl chloride ($CH_3COCl$) in the presence of anhydrous $AlCl_3$?

• Toluene
• Acetophenone
• Benzoyl chloride
• Phenol

13. The reaction that involves the substitution of a hydrogen atom on an aromatic ring by a sulfonyl group is called:

• Halogenation
• Nitration
• Alkylation
• Sulfonation

14. Which of the following is a meta-directing group?

• $-CH_3$
• $-OCH_3$
• $-CHO$
• $-Br$

15. The stability of the arenium ion can be explained by:

• Inductive effect
• Hyperconjugation
• Resonance
• All of the above

16. What is the electrophile in the Friedel-Crafts alkylation of benzene with propene ($CH_3CH=CH_2$) and concentrated $H_2SO_4$?

• Propyl carbocation
• Propyl radical
• Isopropyl carbocation
• Propene

17. Which of the following is the most reactive towards electrophilic attack?

• Benzene
• Toluene
• Chlorobenzene
• Nitrobenzene

18. The meta-directing nature of a nitro group is due to:

• Positive inductive effect
• Positive resonance effect
• Negative inductive effect and negative resonance effect
• Hyperconjugation

19. In Friedel-Crafts acylation, which of the following is an electrophile?

• Acetyl chloride ($CH_3COCl$)
• Acetylium ion ($CH_3CO^+$)
• Aluminum chloride ($AlCl_3$)
• Benzene

20. The reaction of benzene with $Cl_2$ in the presence of anhydrous $FeCl_3$ gives:

• Benzene hexachloride
• Chlorobenzene
• Toluene
• 1,2-dichlorobenzene

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