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(a)
(i) The tendency to exhibit-3 oxidation state decreases down the group due to increase in size and metallic character.
(ii) Acidic character increases from
to 
because down the group, bond enthalpy for dissociation decreases.
(iii) F-F bond is weaker than Cl-F bond due to small size and high electron density, more repulsion between fluorine atoms therefore
is more reactive than 
Whereas in 
bond is stronger than 
. Therefore, 
is more reactive than 
(b)
(i)
(ii)