Among the following which one has weakest carbon-halogen bond?

Among the following which one has bond order as 3?

Among the following which one has the shortest Cl-O bond length

Which among the following has the strongest and weakest ionic bond? Support your answer. in iodides of lithium,sodium,pottassium, cesium

Among the given species the one which contains weakest carbon - oxygen bond : CO_2,CH_3COO^(-),CO,CO_3^(2-)

Among the given species the one which contains weakest carbon - oxygen bond : CO_2,CH_3COO^(-),CO,CO_3^(2-)