Whatsapp icon is not showing in the menu and it is not uninstalled from the phone safe mode is also activated i am using htc desire 820?
Your answer is right i also came across a post that stated the steps involved in uninstalling whatsapp more clearly: Link
To uninstall an app, simply go to Settings > Apps > look for the app you want to uninstall > tap Uninstall.
Simply restart your phone to get out of safe mode.