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Organic : almost done Hydrocarbons
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 Message 16 of 16 in Discussion 
From: MSN Nickname·Steve·  in response to Message 15Sent: 6/23/2006 7:30 AM
unit 5 lesson + don't get!!!!.doc
 

a)   benzene   +   Cl2     ––––�?gt;     chlorobenzene    +    HCl
                                    FeCl3

This is a substitution reaction because a benzene hydrogen was replaced or substituted with a chlorine atom.  This reaction usually requires a catalyst such as FeCl3 or AlCl3.

b)   This is probably a combustion reaction.  The products of the complete combustion of a hydrocarbon are CO2 and H2O.

c)   This is an addition reaction of "H–Y" to an alkene.  We can represent H–Y a little more accurately as "H–OPh" where "Ph" stands for the "phenyl" group which is the benzene ring part.  Recall that you can add water, "H–OH" and alcohols, "H–OR" to an alkene double bond in the presence of an acid catalyst such as H2SO4.  In this case we are adding phenol, C6H5OH or "PhOH", to the double bond.  Phenols are similar to alcohols in many of their reactions.  The H will add to one alkene carbon and the OPh group to the other alkene carbon (bonded to the oxygen).
 

Steve