Answer:   Following event handlers you can have in Global.asax -

Application_End
Application_BeginRequest
Application_EndRequest
Application_PreRequestHandlerExecute
Application_PostRequestHandlerExecute
Applcation_PreSendRequestHeaders
Application_PreSendContent
Application_AcquireRequestState
Application_ReleaseRequestState
Application_ResolveRequestCache
Application_UpdateRequestCache
Application_AuthenticateRequest
Application_AuthorizeRequest
Session_Start
Session_End