Conversion of boron trifluoride to tetrafluoroborate accompanies

(A) increase in symmetry and bond elongation

(B) increase in symmetry and bond contraction

(C) decrease in symmetry and bond contraction

(D) decrease in symmetry and bond elongation

'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