A level chemistry 2018 paper2
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explain why the halogenoalkane is attacked by the nucleophile in this reaction
bromine is more electronegative than carbon Carbon is partially positive Lone pair on nucleophile donated to the partially positive carbon
give two ways of maximising the yield of propanal obtained by distillation
keep the temperature of the reaction below the boiling point cool the distillate
explain how this type of stereoisomeism occurs
lack or rotation around C=C and each carbon in the double bond has 2 different groups attached
06.1 Explain the bonding in and the shape of a benzene molecule. Compare the stability of benzene with that of the hypothetical cyclohexa-1,3,5-triene molecule. Use the data in your answer. [6 marks]
1a) Each C has three (covalent) bonds 1b) Spare electrons (in a p orbital) overlap 1c) delocalised pi ring 2a) planar 2b) hexagonal 2c) C-C bonds are equal lengths 3a) expected stability of cycolehaxtriene is -360 bezene is 152 less exothermic therefore more stable
Primary amines can be prepared by the reaction of halogenoalkanes with ammonia or by the reduction of nitriles. Justify the statement that it is better to prepare primary amines from nitriles rather than from halogenoalkanes
With halogenoalkane: further reaction (of primary amines) With nitriles No further reaction OR Single product / higher atom economy
A student dissolves a few drops of propylamine in $1\text{ cm}^3$ of water in a test tube.Give an equation for the reaction that occurs.Describe what is observed when Universal Indicator is added to this solution.
green turns blue