do we need to learn carbene, nitrene, benzyne and different named reactions including rearrangement for jee advanced?

i have not seen any question related to these in previous papers.

but often seen these topics in all coaching institutions...

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

Using above information

Match the following 

 Dr. Ronald Lance is the greatest spell caster in the world also referred to as the most powerful saiki in the world by those who have used his powerful magic spells, weather you aiming at fixing your love, relationship or marriage, Ronald Lance is a real spells caster for your needs, bear in your mind that you are about to get in touch with our very experienced spells caster verified for casting authentic spells Call/Whats App+27634928462

Plz answer this query.....................................................................................................

how to represent the possible fischer projections for 2-bromohexane