Supernova1138 :
Yes it will mount to LGA 1151 and work with that CPU so long as your case has a 120mm fan port to mount the radiator to. Be aware that lower end AIOs don't offer cooling performance significantly better than midrange aftermarket air coolers and you can't overclock the 8400, so unless you are looking at an AIO purely for aesthetic reasons, it's not really worth getting one.
Thanks a lot SIR for honest reply
i will surly get Cooler Master Hyper RR-212E-20PK-R2 LED CPU Cooler.
Is this air cooler give me adequate performance .
or if any other one is in your view please let me know.