1.

, overset(HBr(1"equivalent"))(rarr) Major product is :

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SOLUTION :`{:(Mn_(2)O_(7)rarrMnO_(2)+O_(2)),(6e^(-)+Mn_(2)(+7)rarr2Mn(+4)),(O_(7)(-2)rarr2O_(2)(-2)+3O_(2)(0)+6e^(-)),(BAR(Mn_(2)O_(7)rarr2MnO_(2)+(3)/(2)O_(2))):}`
`nf=(6)/(1)=6`
`("Molar mass")/("Equivalent mass")=nf=6`


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