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Give the chlorination of methane in presence of hv ? |
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Answer» Solution :One or more hydrogen atoms of alkanes can be replaced by halogens, nitro group and sulphonic acid group. Halogenation takes place either at HIGHER temperature (573-773K) o in the presence of diffused sunlight or ultraviolet light. Lower alkanes do not undergo NITRATION and sulphonation reactions. These reactions in which hydrogen atoms of alkanes are substituted are known as substitution reactons. As an example, chlorination of methane is GIVEN below : Reaction of completely chlorination of methane (i) `underset("Methane")(CH_(4) +Cl_(2))underset(or 573-773)overset(hv)rarr underset("Chloromethane")(CH_(3)Cl+HCl)` ...(i) (ii) `CH_(3)Cl + Cl_(2) overset(hv)rarr underset("Dichlotomethane")(CH_(2)Cl_(2)+HCl)` ...(ii) (iii) `CH_(2)Cl_(2) + Cl_(2) overset(hv)rarr underset("TRICHLOROMETHANE")(CHCl_(3) + HCl)rarr` ....(iii) (iv) `CHCl_(3) + Cl_(2) overset(hv)rarr underset("Tetra-chloromethane")(C Cl_(4)-HCl)rarr` ...(iv) In SHORT `CH_(4)underset(-HCl)overset(Cl_(2), hv)rarr CH_(3)Cl underset(-HCl)overset(Cl_(2), hv)rarr CH_(2)Cl_(2)` `underset(-HCl)overset(Cl_(2), hv)rarr CHCl_(3) underset(-HCl)overset(Cl_(2), hv)rarr C Cl_(4)` ...(v) |
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