11.2. The chemical properties of the halogen elements and the hydrogen halides
A subsection of Chemistry, 9701, through 11. Group 17
Listing 10 of 102 questions
Iodine is used in many inorganic and organic reactions. State and explain the trend in volatility of the halogens, from chlorine to iodine. Explain why HI is the least thermally stable of HCl, HBr and HI. The table shows the electronegativity values for hydrogen, fluorine and iodine. element electronegativity value H 2.1 F 4.0 I 2.5 Explain, in terms of intermolecular forces, why HI has a lower boiling point than HF. Iodine reacts with hot concentrated aqueous sodium hydroxide in the same way as chlorine. Write an equation for the reaction of iodine and hot aqueous sodiumhydroxide. Iodoalkanes contain carbon-iodine bonds. The simplest iodoalkane is CH3I. CH3I can be made from methanol, CH3OH. Identify a reagent that can convert CH3OH to CH3I. 1,2‑diiodoethane, CH2ICH2I, can be made by bubbling ethene into liquid iodine. Fully name the type of mechanism shown in this reaction. J reacts with NaOH, forming different products dependent on the conditions used. I J Name J. J reacts with NaOHto form K. OH K Fully name the mechanism of the reaction of J with NaOHto form K. J reacts with NaOH dissolved in ethanol to form a mixture of two alkenes, L and M. AlkeneL is shown. I NaOH in ethanol and L J M In the box provided, draw the structure of M. Explain why L does not show geometrical (cis-trans) isomerism. L reacts with hot concentrated acidified KMnO4to form propanone and one other organic product. Identify the other organic product. Propanone reacts with excess alkaline aqueous iodine. Complete and balance the equation for this reaction. CH3COCH3 + I2 + OH– CH3COO– + H2O + I– +  State one observation that can be made in the reaction in . 
9701_w20_qp_21
THEORY
2020
Paper 2, Variant 1
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Iodine is used in many inorganic and organic reactions. State and explain the trend in volatility of the halogens, from chlorine to iodine. Explain why HI is the least thermally stable of HCl, HBr and HI. The table shows the electronegativity values for hydrogen, fluorine and iodine. element electronegativity value H 2.1 F 4.0 I 2.5 Explain, in terms of intermolecular forces, why HI has a lower boiling point than HF. Iodine reacts with hot concentrated aqueous sodium hydroxide in the same way as chlorine. Write an equation for the reaction of iodine and hot aqueous sodiumhydroxide. Iodoalkanes contain carbon-iodine bonds. The simplest iodoalkane is CH3I. CH3I can be made from methanol, CH3OH. Identify a reagent that can convert CH3OH to CH3I. 1,2‑diiodoethane, CH2ICH2I, can be made by bubbling ethene into liquid iodine. Fully name the type of mechanism shown in this reaction. J reacts with NaOH, forming different products dependent on the conditions used. I J Name J. J reacts with NaOHto form K. OH K Fully name the mechanism of the reaction of J with NaOHto form K. J reacts with NaOH dissolved in ethanol to form a mixture of two alkenes, L and M. AlkeneL is shown. I NaOH in ethanol and L J M In the box provided, draw the structure of M. Explain why L does not show geometrical (cis-trans) isomerism. L reacts with hot concentrated acidified KMnO4to form propanone and one other organic product. Identify the other organic product. Propanone reacts with excess alkaline aqueous iodine. Complete and balance the equation for this reaction. CH3COCH3 + I2 + OH– CH3COO– + H2O + I– +  State one observation that can be made in the reaction in . 
9701_w20_qp_23
THEORY
2020
Paper 2, Variant 3
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