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15.1. Halogenoalkanes
A subsection of Chemistry, 9701, through 15. Halogen compounds
Listing 10 of 284 questions
Both chloroalkanes and acyl chlorides react with water, but only acyl chlorides fume in moist air. State which product causes the fumes in this reaction. Explain why the reactivities of chloroalkanes and acyl chlorides differ. Compound R is a useful intermediate in the synthesis of pharmaceutical compounds. It can be made from compound P by the following route. CO2H CO2H COCl COCl step 1 step 2 step 4 step 3 CH3CH2NH2 NCH2CH3 P, C8H10 Q, C10H9NO2 R Suggest structures for the starting material P and the intermediate Q. Suggest reagents and conditions for the following steps in the above scheme. step 1 step 2 step 4
9701_s15_qp_41
THEORY
2015
Paper 4, Variant 1
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Both chloroalkanes and acyl chlorides react with water, but only acyl chlorides fume in moist air. State which product causes the fumes in this reaction. Explain why the reactivities of chloroalkanes and acyl chlorides differ. Compound R is a useful intermediate in the synthesis of pharmaceutical compounds. It can be made from compound P by the following route. CO2H CO2H COCl COCl step 1 step 2 step 4 step 3 CH3CH2NH2 NCH2CH3 P, C8H10 Q, C10H9NO2 R Suggest structures for the starting material P and the intermediate Q. Suggest reagents and conditions for the following steps in the above scheme. step 1 step 2 step 4
9701_s15_qp_43
THEORY
2015
Paper 4, Variant 3
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2-bromopropane can be used to synthesise methylethylamine and 2-methylpropylamine. Br 2-bromopropane 2-methylpropylamine NH2 methylethylamine reaction 1 reaction 2 reaction 3 X NH2 Draw the structure of the intermediate X in the box above. Suggest reagents and conditions for • reaction 1, • reaction 2, • reaction 3. Write an equation showing why aqueous solutions of ethylamine are alkaline. Compare the basicities of ethylamine and ammonia. Explain your answer. Solutions containing mixtures of amines and their salts are buffer solutions. Explain what is meant by the term buffer solution. Write two equations to show how a solution containing a mixture of CH3NH2 and CH3NH3Cl acts as a buffer.
9701_s16_qp_42
THEORY
2016
Paper 4, Variant 2
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Questions Discovered
284