reaction with 
?
(i) 
or
(ii) 
or
Answer:
(i) Lesser the bond dissociation energy, faster is the reaction so find the molecule in which bond dissociation enthalpy is less.
(ii) If both the groups are same, steric hindrance will be considered.More the steric hindrance, lesser the reactivity.
(i) 
will react faster because bond dissociation enthalpy ofC?I bond is less than that of C?Br bond.
(ii) 
will react faster because of less steric hindrance as compared to 
.
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