#Hooks

Why should hooks not be defined inside conditional statements like if? Explain the implications this has on component behavior.

List all the hooks you are aware of in React and explain the difference between 'useRef' and 'useState'.

Implement a timer application. Explain the use of 'useState(prevTime => prevTime + 1)' while coding a timer. Additionally, convert the timer functionality into a custom hook.

Apart from component unmounting, when else does the return function inside useEffect get invoked in React? Discuss scenarios.

Where else can predefined hooks be utilized beyond functional components in React? Provide details regarding custom hooks.