Which of the following orders is not correct regarding the -I effect of the substituents ??

(a) -I<-Cl<-Br<-F
(b) -N⁺R₃<-O⁺R₂

(C) -N⁺R₂<-OR<-F

(d) -SR<-OR<-O⁺R₂

The ans is given as (a) which i think is wrong

it must be (d)

Pls explain

'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