CAIE A-Level Chemistry AS Organic Chemistry Conventions and Functional Group Reference Questions

Practise reading syllabus organic notation and recognising functional groups from displayed, structural or skeletal formulae.

Exam points

interpret X as a halogen and R or R′ as alkyl groups or hydrogen in generic structures
identify each functional group from its defining atom sequence rather than from the compound name alone
distinguish aldehyde, ketone, acid and ester carbonyl environments in multifunctional molecules

Covered syllabus points

Reference—AS organic notation conventions Reference—AS organic functional groups

[Maximum number: 1]

Compound V is a liquid.
V contains 77.2 % carbon, 11.4 % hydrogen and 11.4 % oxygen by mass.
V has a relative molecular mass of 280 .

W, X and Y have the same molecular formula, $\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}$ .

W, X and Y are added separately to different reagents. Observations for these reactions are described in Table 4.1.

Table 4.1

W, X and Y each contain a common functional group.

Name the functional group that is present in all three compounds.

[Maximum number: 1]

Compound W has molecular formula $\mathrm{C}_{4} \mathrm{H}_{10} \mathrm{O}$ . It contains only one functional group.

Y is a structural isomer of W.

Both W and Y produce colourless bubbles when sodium is added to them.
Y does not react when heated with acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ .
Y does not react when warmed with alkaline $I_{2}(a q)$ .

Name the functional group present in Y.

[Maximum number: 1]

1,3-dichloropropan-2-ol can be made by reacting M.

Figure for Question 3 — CAIE A-Level Chemistry AS

Name the functional group present in M that changes during this reaction.

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Covered syllabus points

Question 1

Question 2

Question 3