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# Which of the following species contain covalent coordinate bonds? $(i)\; AlCl_3 \\ (ii)\;CO \\ (iii)\;[Fe(CN)_6]^{4-} \\ (iv)\; NO_3^{-}$

$(a)\;\text{(i),(ii) and (iii) } \\ (b)\;\text{(i),(ii) and (iv)} \\(c)\;\text{(ii),(iii) and (iv) } \\(d)\;\text{(i),(iii) and (iv)}$

Hence c is the correct answer.