19) The reagent which will distinguish between 1-butene and 1-butyne is (A) KMnO4 (B) H2SO4 (C) Br2 in CCl4 (D) [Ag(NH3)2]+ Gimme the ans plsss with the apt explaination !!!

'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