What should be the acidity order of following complexes.Please give explanation for each.

[Mn(h2o)6)]^2+ [Ni(h2o)6)]^2+. [Al(h2o)6]^3+ [Fe(h2o)6]^3+

Please tell the correct acidity order.

'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