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प्रश्न
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.
उत्तर
Electrophiles are reagents that participate in a reaction by accepting an electron pair in order to bond to nucleophiles.
The higher the electron density on a benzene ring, the more reactive is the compound towards an electrophile, E+ (Electrophilic reaction).
While CH3– is an electron donating group, NO2– group is electron withdrawing. Hence, toluene will have the maximum electron density and is most easily attacked by E+.
NO2– is an electron withdrawing group. Hence, when the number of NO2– substituents is greater, the order is as follows:
Toluene > p–CH3–C6H4–NO2, p –O2 N–C6H4–NO2
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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.
Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene.
For an electrophilic substitution reaction, the presence of a halogen atom in the benzene ring:
(i) deactivates the ring by inductive effect
(ii) deactivates the ring by resonance
(iii) increases the charge density at ortho and para position relative to meta position by resonance
(iv) directs the incoming electrophile to meta position by increasing the charge density relative to ortho and para position.
Why do alkenes prefer to undergo electrophilic addition reaction while arenes prefer electrophilic substitution reactions? Explain.
Why does presence of a nitro group make the benzene ring less reactive in comparison to the unsubstituted benzene ring. Explain.
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:
In Friedel-Crafts alkylation of aniline, one gets ______.
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:
Which of the following would not give 2-phenylbutane as the major product in a Friedel-Crafts alkylation reaction?
