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Class 10 > Learn Class IX-X Tuition > Why iodoform is solid ?
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Why iodoform is solid ?

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As we know that solid has definite volume and rigid shape and in-compressible.solid have their melting and boiling point above room temperature.Similarly IODOFORM is yellow crystalline have rigid shape.melting point at 120 degree C and boiling point 410 which is above room temperature and insoluble in...
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Yellow crystalline insoluble volatile solid with a penetrating sweet odour made by heating alcohol with iodine and an alkali: used as an antiseptic.
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Iodine is a bulky atom which makes the iodoform molecule very large. Hence there is strong van der Waal's force of attraction between the molecules which makes it solid. Chlorine is relatiely smaller...so vdW force is weaker...hence a liquid.
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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

Iodine is bigger that chlorine. So it can be better polarized so intermolecular forces are more intensive in iodoform.
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Iodoform , CHI3, yellow crystalline solid that has a penetrating odor. It melts at 119°C and is insoluble in water but soluble in ether or ethanol. Iodoform was formerly used as an antiseptic. It is produced when a methyl ketone, acetaldehyde, or an alcohol with the formula RCHOHCH3 (where R is hydrogen...
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Iodoform , CHI3, yellow crystalline solid that has a penetrating odor. It melts at 119°C and is insoluble in water but soluble in ether or ethanol. Iodoform was formerly used as an antiseptic. It is produced when a methyl ketone, acetaldehyde, or an alcohol with the formula RCHOHCH3 (where R is hydrogen or an alkyl or aryl group) is treated with sodium hydroxide and iodine. read less
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London Dispersion Forces are strong due to higher polarizing ability, if molecules are bigger. As Iodine is bigger than other halogens, the outer most electrons can be easily dispersed and polarized. Thus iodoform is solid at room temperature.
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Iodine is bigger that chlorine. So it can be better polarized so intermolecular forces are more intensive in iodoform ,,
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"Read , Recall and Procure"

Yellow crystalline insoluble volatile solid with a penetrating sweet odour made by heating alcohol with iodine and an alkali: used as an antiseptic. Formula: CHI3. Systematic name: triiodomethane
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