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Assertion: Nitrobenzene is used as a sol...

Assertion: Nitrobenzene is used as a solvent in Friedel-Craft's reaction.
Reason: Fusion of nitrobenzene with solid KOH gives a low yield of a mixture of o-and p-nitro phenols.

A

If both assertion and reason are true, and reason is the true explanation of the assertion.

B

If both assertion and reason are ture, but reason is not the true explanation of the assertion.

C

If assertion is true, but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Correct explanation: Due to strong electron-withdrawing resonance and inductive effect of the `-NO_(2)` group, electron density decreases in the benzene ring and hence it does not undergo F.C. benzene ring and hence it does not undergo F.C. reaction.
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Alkylation of aromatic compounds with aliphatic compounds like halides in presence of Lewis acid catalyst is known as Friedel-Crafts alkylation. It is an exapmle of electrophilic substitution. In the process of acylation, R-overset(O)overset(||)C- group is introduced to the ring. Compounds having ( + mesomeric groups) like -NH_(2) do not give Friedel-Crafts reaction because these compounds undergo conjugation with the catalyst. In the alkylation process, most branched alkyl group is substituted because isomerisation of carbonium ion takes place. In some Friedel-Crafts reactions, the nature of product changes with the solvent used in the reaction. Predict whether the following statements are ture or false: Carbocations undergo isomerisation in Frieded-Crafts reaction. In each of the following alkyl halides the isomerisation takes place: CH_(3)-CH_(2)-CH_(2)-Cl , CH_(3)-CH_(2)-CH_(2)-CH_(2)-Cl (a) True (b) False

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Knowledge Check

  • Assertion (A) : Nitrobenzene does not undergo Friedel-crafts reaction. Reason (R) : Nitrogroup in nitrobenzene deactivates the benzene ring.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is not a correct explanation of A.
    C
    A is true but R is false.
    D
    A is false but R is false.

  • Assertion: Aniline does not undergo Friedel-Crafts reactions. Reason: -NH_2 group of aniline reacts with AlCl_3 to give acid-base reaction.

    A
    A and R are true and R is the correct explanation of A
    B
    A and R are true and R is not the correct explanation of A
    C
    A is true R is false
    D
    A is false R is true

  • For a Friedel - Craft reaction using AlCl_3 which compound can be used as solvent, benzene or nitrobenzene ?

    A
    nitrobenzene but not benzene
    B
    benzene but not nitrobenzene
    C
    both benzene and nitrobenzene
    D
    neither benzene nor nitrobenene