Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E
(a) Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene
(b) Toluene, p-H3C–C6H4–NO2, p-O2N–C6H4–NO2.
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).
(a) The presence of an electron withdrawing group (i.e., NO2–and Cl–) deactivates the aromatic ring by decreasing the electron density.
Since NO2–group is more electron withdrawing (due to resonance effect) than the Cl– group (due to inductive effect), the decreasing order of reactivity is as follows:
Chlorobenzene
1. Formation of ozone hole is maximum over
2. The inert gases are ____ in water.
3. Nucleus of an atom consists of
4. Which of the following is used as anesthetic ?
5. Milk of Magnesia is a suspension of :
6. Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water
7. Spirit in contact with body gives cool sensation because it is :
8. The freezer in a refrigerator isfitted near the top
10. Question 14.3:Carbon monoxide gas is more dangerous than carbon dioxide gas. Why?