14.2. Alkenes
A subsection of Chemistry, 9701, through 14. Hydrocarbons
Listing 10 of 191 questions
The molecular formula C3H6 represents the compounds propene and cyclopropane. CH3CH CH2 propene cyclopropane C H H C H H C H H What is the H–C–H bond angle at the terminal =CH2 group in propene? Under suitable conditions, propene and cyclopropane each react with chlorine. With propene, 1,2-dichloropropane, CH3CHCl CH2Cl is formed. State fully what type of reaction this is. When cyclopropane reacts with chlorine, three different compounds with the molecular formula C3H4Cl 2 can be formed. Draw displayed structures of each of these three compounds.
9701_w13_qp_21
THEORY
2013
Paper 2, Variant 1
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The molecular formula C3H6 represents the compounds propene and cyclopropane. CH3CH CH2 propene cyclopropane C H H C H H C H H What is the H–C–H bond angle at the terminal =CH2 group in propene? Under suitable conditions, propene and cyclopropane each react with chlorine. With propene, 1,2-dichloropropane, CH3CHCl CH2Cl is formed. State fully what type of reaction this is. When cyclopropane reacts with chlorine, three different compounds with the molecular formula C3H4Cl 2 can be formed. Draw displayed structures of each of these three compounds.
9701_w13_qp_22
THEORY
2013
Paper 2, Variant 2
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A mixture of amino acids can be separated by electrophoresis. During an electrophoresis experiment, ● different amino acids move in different directions, ● different amino acids move at different speeds, ● some amino acids do not move at all. Explain these observations. A mixture of amino acids can also be separated by thin-layer chromatography. Identify the mobile and the stationary phases in this type of chromatography. mobile phase stationary phase What is the process by which thin-layer chromatography can separate a mixture? State three structural features of DNA. Some diseases are caused by a mutation in the DNA base sequence which results in one amino acid being replaced by another during protein synthesis. Suggest what changes in the interactions that form the tertiary structure would result from a mutation that replaced a valine residue with a serine residue. CH3 CH3 CH C HC val NH O OH CH2 CH C ser NH O replaced by
9701_w14_qp_41
THEORY
2014
Paper 4, Variant 1
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Questions Discovered
191