WorksheetsChemistry_2013_STPM term 3_Objectives
Total questions: 15
Worksheet time: 8mins
How many C − C sigma bonds are in the molecule?
5
6
10
11
Based on the data given, which statement is true?
Anilinium ion is the most acidic species.
4 − Nitroanilinium ion is the most stable species.
4 − Nitroanilinium is more stable than 4 − nitrobenzoate ion.
Nitrobenzoate ion is a weaker conjugate base than 4 − nitrobenzoate ion.
Which statement about the reaction between methybenzene and chlorine in the presence of light is true?
The reaction is a free − radical addition reaction.
Hydrogen chloride is formed in the termination step.
( Chloromethyl) benzene is formed in the first propagation step.
1 − Chloro − 4 − methylbenzene is one of the products of the reaction.
Ethene undergoes addition reaction due to the presence of C = C bond. Which is not true of the bromination of ethene?
The C = C bond readily accepts as electrophile.
Bromonium ion is formed as an intermediate.
A π bond is converted to a σ bond.
The product formed is 1, 1 − dibromoethane.
Ethylbenzene reacts with concentrated nitric acid and concentrated sulphuric acid followed by acidified potassium manganate (VII). What is the structure formula of the product formed?
Compound X is produced from catalytic oxidation of an alkene. It has the percentage composition by mass : carbon 38.7%, hydrogen 9.70%, oxygen 51.6%. When 0.890 g of X is heated at 400K, the vapour produced occupies a volume of 477cm3 at 100kPa. Which statement about X is not true? [ The gas constant, R, is 8.31 J K-1 mol-1 ]
The empirical formula of X is CH3O
Compound X is 1 , 2 − ethanediol
One mole of X reacts with Na releasing two moles of H2 gas.
Compound X is used as an antifreeze in the radiator.
Which organic compound produces a white precipitate in the shortest possible time when its solution is shaken vigorously with an ethanolic silver nitrate solution at room temperature?
Chloroethane hydrolyses easily in an aqueous of sodium hydroxide whereas hydrolysis of chlorobenzene requires high temperature and pressure. Which statement best explains the low reactivity of chlorobenzene toward hydrolysis?
The non − bonding electrons of Cl are delocalised into the benzene ring.
The Cl atom withdraws the electron clouds from the benzene ring.
The Cl atom is strongly bonded to the benzene ring.
The C − Cl bond in chlorobenzene is shorter.
Which compound forms a white precipitate when heated with an aqueous solution of sodium hydroxide followed by acidification?
Phenylethene is produced when compound X reacts with concentrated sulphuric at 180°C. What could compound X be?
Phenylmethanol
2 − Phenylmethanol
1 − Phenyl − 1 − propanol
2 − Phenyl − 1 − propanol
Which reagent or reaction condition corresponds correctly with each stage?
Stage Ⅰ Stage Ⅱ Stage Ⅲ
Which reagent can be used to distinguish P from Q?
Alkaline iodine solution
2, 4 − Dinitrophenylhydrazine
Bromine and ion (Ⅲ) bromide
Acidified potassium dichromate (VI) solution
Which two compounds will be formed during the esterification of ethanoic acid with ethanol which has been labelled with oxygen − 18 isotope?
Compound X is optically active and its aqueous solution can acts as a buffer. What could compound X be?
The repeating unit for a very useful commercial plastic is as follows:
- HNCH2CH2CH2CH2CO −
Which statement about the plastic is true?
It is a copolymer.
It is a polyester.
Its monomer is an amino acid.
It is formed the condensation reaction between HOOCCH2CH2CH2NH2 and NH2CH2COOH.
