But many fashion experts say that anyone of any age can wear jeans as long as they're comfortable. But many people say they have a tough time finding the perfect pair of jeans. The survey said one in ten people over 53 try on six pairs and spend five days shopping for a new pair of jeans.
The iodoform test or iodoform reaction is a qualitative chemical test for the detection of ketones and aldehydes carrying an alpha methyl group. The reagents are iodine and sodium hydroxide.Only methyl ketones, or alcohols with the feature: CH3CH(OH)-R may undergo this reaction.The iodoform test or reaction is a chemical reaction where iodoform (CHI3) is produced by the multiple halogenation of a methyl ketone (a molecule containing the R-CO-CH3 group) in the presence of a base. R may be H, alkyl or aryl.
The reactions involve the oxidation of iodide ion (I-) to dissolved iodine (I2) or tri-iodide ion (I3-). Either of these combine with starch indicator to produce the characteristic purple-blue color. This color is visible to the eye when the concentration of iodine or tri-iodide ion exceeds 10-5 moles/liter. A typical reaction is: 6 H+ + IO3- + 8 I- -> 3 I3- + 3 H2O. The rate of this reaction depends on the temperature, and on the concentrations of iodate, iodide, and hydrogen ions.