P2 Y13 DEC MOCK

Question 1

define stereoisomers

Answer 1

compounds with the same structural formula with atoms arranged differently in space

Question 2

define nucleophile

Answer 2

lone pair donator

Question 3

ozone decomposition reactions

Answer 3

Cl* + O3 -> ClO* + O3

ClO* + O3 -> Cl* + 2O2

Question 4

test for carboxylic acid

Answer 4

• Na2CO3
• effervescence
• limewater turns milky

Question 5

test for alcohols

Answer 5

• acidified potassium dichromate
• orange -> green

Question 6

test for aldehydes

Answer 6

• acidified potassium dichromate = orange -> green
• tollen’s = silver mirror
• fehling’s solution = red ppt

Question 7

catalytic cracking conditions

Answer 7

• zeolite catalyst
• moderate pressure

Question 8

IMFs of aldehydes

Answer 8

dipole-dipole

Question 9

explain the bonding in and the shape of a benzene molecule

Answer 9

• each C has 3 covalent bonds
• spare electrons (in a p orbital) overlap
• ring of delocalised electrons
• planar shape
• 6 carbon ring with 120 degree bond
  angle per carbon
• C-C bonds equal in length between that of a single and a double

Question 10

dissolve the impure compound in a minimum volume of hot solvent

Answer 10

obtain saturated solution and to enable crystallisation on cooling

Question 11

hot filter solution through filter paper quickly

Answer 11

remove insoluble impurities

Question 12

cool the filtered solution on ice

Answer 12

crystals will reform

Question 13

suction filtrate with a Büchner flask to separate out crystals

Answer 13

speeds up filtration

Question 14

making reactive species for Friedel Crafts

Answer 14

AlCl3 + CH3COCl -> All4- + CH3CO+

Question 15

making reactive species NO2

Answer 15

HNO3 + 2H2SO4 -> NO2+ + 2HSO4- + H3O+