Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen ?

(A) HNO3 , NO, NH4Cl, N2

(B) HNO3, NO, N2, NH4Cl

(C) HNO3, NH4Cl, NO, N2

(D) NO, HNO3, NH4Cl, N2

'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