Which is more reactive towards the nucleophilic substitution reaction

Flouro para nitro benzene

Chloro para nitro benzene

Plz explain with respect to inductive mesomeric effects....plzzz

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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Plz answer this query.....................................................................................................

how to represent the possible fischer projections for 2-bromohexane