Answer
(a) Br$_2$(l) + 2Cl$^–$(aq)
(b) no reaction
(c) no reaction
(d) no reaction
Work Step by Step
(a) Cl$_2$(g) + 2Br$^–$(aq) --> Br$_2$(l) + 2Cl$^–$(aq)
(b) I$_2$(s) + Cl$^–$(aq) --> no reaction
(c) I$_2$(s) + Br$^–$(aq) --> no reaction
(d) Br$_2$(l) + Cl$^–$(aq) --> no reaction