Most laptop CPU's are soldered to the motherboard these days so unless you know your is not assume its a no go. Then you have cooling and power requirements, the cooler or power circuit may not be able to handle a higher wattage cpu. Even if your laptop model had a version with the i7 its likely the i7 version had at least a better cooler and possibly better power delivery.
Bottom line is laptops are rarely made for cpu upgrades. Even if you can where are you going to buy a mobile cpu from?