IB Chemistry HL S3.2 Functional groups: classification of organic compounds questions

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Question 1

Paper 2Hard9 marks

A laboratory is checking whether molecular formula alone is sufficient to classify oxygen-containing compounds. Figure 1 shows the structural formulae of four compounds.

ACDBCH3CH2OHCH3OCH2CH3CH3OCH2CH2CH3CH3CH2CH2OH
(a)

Determine the molecular formula of compound A.

[1]
(b)

Using Figure 1, identify two pairs of successive members of homologous series. For each pair, name the series and state the structural change from the smaller member to the larger member.

[4]
(c)

State the general formula for each series identified in (b), using nn for the number of carbon atoms.

[2]
(d)

A technician claims that a molecular formula of C3H8O\mathrm{C_3H_8O} is sufficient to determine uniquely whether a compound belongs to the alcohol or ether series. Evaluate this claim using Figure 1.

[2]

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