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प्रश्न
Why does presence of a nitro group make the benzene ring less reactive in comparison to the unsubstituted benzene ring. Explain.
उत्तर
Nitro group is an electron-withdrawing group (-R and -I effects). It deactivates the ring by decreasing nucleophilicity for further substitution.
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संबंधित प्रश्न
Arrange the set of compound in order of their decreasing relative reactivity with an electrophile, E+ Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene.
Arrange the set of compound in order of their decreasing relative reactivity with an electrophile, E+ Toluene, p-H3C–C6H4–NO2, p-O2N–C6H4–NO2.
Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene.
In an electrophilic substitution reaction of nitrobenzene, the presence of nitro group:
(i) Deactivates the ring by inductive effect.
(ii) Activates the ring by inductive effect.
(iii) Decreases the charge density at ortho and para position of the ring relative to meta position by resonance.
(iv) Increases the charge density at meta position relative to the ortho and para positions of the ring by resonance.
Assertion (A): Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid.
Reason (R): The mixture of concentrated sulphuric acid and concentrated nitric acid produces the electrophile, \[\ce{NO^{+}2}\].
Choose an INCORRECT statement about the electrophilic substitution reaction mechanism from the following:
Excess of isobutane on reactions with Br2 in presence of light at 125°C gives which one of the following, as the major product?
hydrocarbon (X) major product X is:
Benzene on nitration gives nitrobenzene in presence of HNO3 and H2SO4 mixture, where ______.
Which of the following would not give 2-phenylbutane as the major product in a Friedel-Crafts alkylation reaction?
