Explanation

Electron transport chain takes place in the inner mitochondrial membrane and consists of flavins, ubiquinone, cytochromes and oxygen as electron carriers. Sequence of electron transport : NAD$H_{2}$ $\rightarrow$ FAD $\rightarrow$ Co-Q $\rightarrow$ Cytochrome -b $\rightarrow$ Cyt-$c_{1}$ $\rightarrow$ Cyt-a $\rightarrow$ Cyt –$a_{3} \rightarrow$ O₂