Can you explain the reason for the much high reactivity of grignard reagent and why a unusual negative charge apperas on carbon in the grignard reagent ?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms Using above informationMatch the following

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how to represent the possible fischer projections for 2-bromohexane

Calculate the water crystallization percentage for sodium carbonate decahydrate