Which mitochondrial complex donates electrons to molecular oxygen during $ETS$?

When energy is released from $FADH_2$,through which complex do electrons $NOT$ pass?

The enzymes required for $ETS$ are arranged in/on . . . . . . .

Given below are two statements.
Statement-$I$: Cytochrome $c$ is a small, copper-containing protein loosely attached to the inner membrane.
Statement-$II$: Cytochrome $c$ acts as a mobile electron carrier transferring electrons between complex $I$, $II$, and $IV$.
In the light of the above statements, choose the correct answer from the options given below.

How many molecules of $ATP$ are generated through $ETS$ after complete oxidation of one glucose molecule?

Chemiosmotic mechanism of $ATP$ production in aerobic respiration was given by