(Thank you sir for clearing my doubt.But ,I have a little more doubt .Can you please clear it.It's a huble request please air clear my doubt as soon as possible.)

Q-How empty d orbital participate in resonance even it is at 1,2 position i.e.sulphur and carboanion. Please sir reply with full explanation.

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

 

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how to represent the possible fischer projections for 2-bromohexane