DP Chemistry (first assessment 2025)

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Question 23M.2.SL.TZ1.3

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Date May 2023 Marks available [Maximum mark: 4] Reference code 23M.2.SL.TZ1.3
Level SL Paper 2 Time zone TZ1
Command term Draw, Outline, State Question number 3 Adapted from N/A
3.
[Maximum mark: 4]
23M.2.SL.TZ1.3

Alkanes form a homologous series.

(a.i)

Outline the meaning of homologous series.

[1]

Markscheme

compounds of the same family AND general formula
OR
compounds of the same family AND differ by a common structural unit/CH2 ✓

 

Accept contains the same functional group for same family.

(a.ii)

State the preferred IUPAC name for the following compounds.

[2]

Markscheme

  2-chlorobutane ✓

 1-chloro-2-methylpropane ✓

 

Accept 1-chloromethylpropane for M2, but not 2-methyl-1-chloropropane.

(a.iii)

But-2-ene can be polymerized. Draw a section of the resulting polymer showing two repeating units.

[1]

Markscheme

 

Allow any orientation of methyl groups.
Ignore square brackets and “n”.
Continuation lines must be shown.