Consider the molecule
CH₃CH₂CH₂CH₂CHClCH₂CH₃.

The systematic name of this molecule is
A. 5-chloroheptane.
B. 3-chloroheptane.
C. 5-chlorooctane.
D. 3-chlorooctane.

The raspberry- flavoured food additive, butyl methanoate, can be prepared from CH₃CH₂CH₂CH₂OH using
A. an addition reaction with HCOOH.
B. an addition reaction with CH₃COOH.
C. a condensation reaction with HCOOH.
D. a condensation reaction with CH₃COOH.

Solution

The number of structural isomers that are carboxylic acids with the formula C₄H₈O₂ is
A. 1
B. 2
C. 3
D. 4

Solution

Two chemical reactions occur as follows.
CH₂=CH CH₂CH₂CH₃ + X → 2-chloropentane

and

2-chloropentane + sodium hydroxide solution → Y
X and Y are given by

A. X= Cl₂ and Y= CH₃CH₂CH₂CHOHCH₃
B. X= HCl and Y= CH₃CH₂CH₂CHOHCH₃
C.X= Cl₂ and Y= CH₃CH₂CH₂CH₂CH₂OH
D. X= HCl and Y= CH₃CH₂CH₂CH₂CH₂OH

Solution

A short section of a polymer molecule is shown below.
–CH₂CF₂CF₂CH₂CF₂CH₂CH₂CF₂CH₂–
This polymer could have been formed from
A. CF₂CH₂ only.
B. CF₂CF₂ and CH₂CH₂.
C. CF₂CF₂ and CH₂CHCF₃.
D. CH₃CHCF₂ and CF₃CHCF₂.

Solution

The molecule HOCH₂CH₂CH₂COOH (molar mass = 104 g /mol–) forms a polymer in which the average polymer molecule contains 1000 monomer units.
The approximate molar mass of the polymer, in g/mol–, is
A. 68 000
B. 86 000
C. 95 000
D. 104 000

Solution

A student was given four colourless liquids that were labelled A, B, C and D. They were known to be ethanol, ethanoic acid, pentane and hexene, but the exact identity of each liquid was unknown.
The student tested the properties of three of the liquids and obtained the results shown on the right.

Identify each of the liquids.

Solution