Can a 16-bit microcontroller contain 32-bit microprocessor?
No, it wouldn't make sense for a 16-bit microcontroller to contain a 32-bit microprocessor. You might have micontrollers with different bit width for their data and memory bus. But it would make no sense to refer to a microcontroller as being a "16-bit microcontroller" if their operations are done with 32 bits. You would just say it is a 32-bit microcontroller, also, even for a 32-bit microcontroller they would not implement 32 bit wide memory lines, they would have it just as wide enough to access all the memory blocks of that specific model or (maybe) to fit all model of the same family.