A rear naked choke works by cutting off blood flow to the brain via the carotid arteries. The brain can last a maximum of 4 minutes without blood flow.

armbar, flying armbar, triangle choke, north south choke, rear naked choke, kneebar, spinning kneebar, kimura, guillotine.

No jon jones won via rear naked choke in the 4th round

I think it's a variation of the rear naked choke but I'm not 100% sure.

A couple of minuts. No blood-flow to the brain will cause death.