Which one of the following is not the representative of lewis acid-base adduct?

A)pf3 + f2 =pf5

B)h2o + h+=h3o+

C)Al(oh)2 + oh- =Al(oh)4

D)(ch3)3n + bf3 =(ch3)3nbf3

'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