what is the cprrect order of stability...(1)H2C=N(+ve charge in N)=N(-ve charge in N)

(2)H2C-N=N(-ve charge in this N)

(3)H2C(-ve charge in c)-N(+ve charge in N)(triple bond)N

(4)H2c(-ve charge in C)-N(triple bond)N(=VE CHARGE IN N)

'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