What would happen if the Sun suddenly became a black hole without changing its mass?

What would happen if the Sun suddenly became a black hole without changing its mass?
The black hole would quickly suck in the Earth.
Earth would gradually spiral into the black hole.
Earth’s orbit would not change.

What would happen if our sun would have suddenly disappeared ?

Assuming that our sun would have suddenly disappeared (for no reason at all, fictionally), would Jupiter take over the solar system? What I mean is that, Jupiter is the largest planet in our solar system, and so it will attract other planets with its gravitational pull and thus be acting as a “failed star” which [...]

What would be observed on Earth if the Sun’s source of energy generation were to suddenly shut off?

What would be observed on Earth if the Sun’s source of energy generation were to suddenly shut off?
The Sun would become a red giant.
We would immediately freeze.
The Sun would get fainter.
The Sun would get brighter.
We wouldn’t detect any neutrinos at all.