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Presence of a nitro group in a benzene r...

Presence of a nitro group in a benzene ring:

A

Activates the ring towards electrophilic substituion

B

Renders the ring basic

C

Deactivates the ring towards nucleophilic substitution

D

Deactivates the ring towards electrophilic substitution

Text Solution

Verified by Experts

The correct Answer is:
D
`-NO_(2)`group shows`-M`effect,so withdraw the electron density from the ring and hence deactive the ring towards electrophilic aromatic substitution.
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Why does presence of a nifro group make the benzene ring less reactive in comparison to the unsubstituted benzene ring . Explain .

Assertion: Presence of a nitro group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution. Reason: Nitro group, being an electron withdrawing group, decreases the electron density over the benzene ring.

Knowledge Check

  • Statement-1. The reaction of conc. HNO_3 and conc. H_2SO_4 on nitrobenzene gives m- dinitrobenzene. Statement-2. The nitro group in benzene ring decreases the electron density in the benzene ring.

    A
    Statement-1 is True, Statement-2 is True , Statement-2 is a correct explanation for Statement-1
    B
    Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for Statement-1
    C
    Statement- 1 is True, Statement-2 is False
    D
    Statement-1 is False, Statement -2 is True

  • For an electrophilic substitution reaction , the presence of a halogen atom in the benzene ring …..

    A
    deactivates the ring by inductive effect
    B
    deactivates the ring by reasonance
    C
    increases the charge density at ortho and para position relative to meta position by resonance.
    D
    directs the incoming electrophile to meta position by increasing the charge density relative to ortho and para position.

  • The methyl group in benzene ring is :

    A
    Ortho directing
    B
    Ortho and meta directing
    C
    Para directing
    D
    Ortho and para directing

    • Similar Questions

    Explore conceptually related problems

    Assertion (A) Presence of a nitro group at ortho or para position increases the reactivity of haloarenas towards nucleophilic substitution. Reason (R ) Nitro group, being an electron withdrawing group decreases the electron density over the benzene ring.

    Assertion: Presence of a nitro group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution. Reason: Nitro group, being an electron withdrawing group decreases the electron density over the benzene ring.

    Assertion (A): In nucleophilic substitution reactions the presence of nitro group increases the reaction of aryl halides. Reason (R): The intermediate carbanion is stabilized due to the presence of nitro group.

    The presence of the chlorine atom on benzene ring makes the second substituent enter at a position

    Assertion (A) : The presence of nitro group facitates nucleophilic substiution reaction in aryl halide. Reason (R): The intermdiate carbonion is stablised due to the presence of the nitro group.

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