This is a list of the supported processors for Windows 11 and the i7-7700 is not on the list. There are only 3 generation 7 CPUs on the list and one of them only on 2 specific systems. The other 2 are i7-7800 series but are not supported by your chipset according to Intel. I have mentioned this a number of times in the forum but could you install Windows 11 using the media creation tool found here  (second choice)? Probably but keep in mind that MS will not support your system which means at the least no OS updates and possibly no security updates. Also should you require tech support Dell support techs will insist that you reinstall Windows 10 before they will offer assistance.
I have an Inspiron I5459-4020 with chipset h110 and socket FCLGA1151. Original i5-6400T processor isn't compatible with Windows 11. This is the only thing keeping me from the OS upgrade. It looks like the i7-7700 series might work with this motherboard, looking for confirmation on this. I can purchase the 7700K processor for around $400 (+/-) which is way cheaper than finding a new machine with compatible stats running Windows Pro. Confirmation or alternative suggestions greatly appreciated. 
I5459-4020 Processor Upgrade