High Quality Content by WIKIPEDIA articles! Iodine monochloride is the chemical compound with the formula ICl. It is a red-brown compound that melts near room temperature. Because of the difference in the electronegativity of iodine and chlorine, ICl is highly polar and behaves as a source of I+. Preparation of iodine monochloride entails simply combining the halogens in a 1:1 molar ratio, according to the equation: I2 + Cl2 ? 2 Icl. When chlorine gas is passed through iodine crystals, one observes the brown vapor of iodine monochloride. Dark brown iodine monochloride liquid is collected. Excess chlorine converts iodine monochloride into iodine trichloride in a reversible reaction: ICl + Cl2 Icl3.

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