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IB Chemistry HL 3.2 How Much? Question Bank

Practise IB Chemistry HL 3.2 with evidence-led questions on moles, quantities, calculations and chemical measurements.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Covered syllabus points

3.2.1—Organic formulas3.2.2—Functional groups3.2.3—Homologous series3.2.4—Physical property trends3.2.5—IUPAC nomenclature3.2.6—Structural isomers3.2.7 (HL)—Stereoisomers3.2.8 (HL)—Mass spectrometry3.2.9 (HL)—Infrared spectroscopy3.2.10 (HL)—¹H NMR spectroscopy3.2.11 (HL)—NMR splitting patterns3.2.12 (HL)—Combined data analysis

3.2 Functional groups: Organic compounds question 1

[Maximum number: 2]

Question (a)

(a)

An organic compound, X, with a molar mass of approximately 88 g mol−188 \mathrm{~g} \mathrm{~mol}^{-1} contains 54.5 % carbon, 36.3 % oxygen and 9.2 % hydrogen by mass.

[ 2 ]

Question (i)

(i)

X is a straight-chain carboxylic acid. Draw its structural formula.

[ 1 ]

Question (ii)

(ii)

Draw the structural formula of an isomer of X which is an ester.

[ 1 ]

3.2 Functional groups: Organic compounds question 2

[Maximum number: 9]

Organic compounds have many industrial applications.

Question (a)

(a)

The following organic compound, X, is used as a flavouring agent.

Figure for Question (a) — IB Chemistry HL
[ 5 ]

Question (i)

(i)

State the name of the functional group present in X.

[ 1 ]

Question (ii)

(ii)

Deduce the systematic name of X using IUPAC nomenclature.

[ 1 ]

Question (iii)

(iii)

Deduce the number of signals and their relative areas (integration traces) in an 1H{ }^{1} \mathrm{H} NMR spectrum of X.

Number of signals:
Relative areas:

[ 2 ]

Question (iv)

(iv)

Draw an isomer of X which belongs to a different homologous series.

[ 1 ]

Question (b)

(b)

An alkene such as ethene can be used as starting material for a range of compounds.

[ 1 ]

Question (i)

(i)

State the general formula for the homologous series of alkenes.

[ 1 ]

Question (c)

(c)

The chloroalkene with the formula C4H7Cl\mathrm{C}_{4} \mathrm{H}_{7} \mathrm{Cl} can exist as several stereoisomers.

[ 3 ]

Question (i)

(i)

Draw the structural formula of cis-1-chlorobut-2-ene.

[ 1 ]

Question (ii)

(ii)

Deduce the structure of a chloroalkene, C4H7Cl\mathrm{C}_{4} \mathrm{H}_{7} \mathrm{Cl}, that can exhibit optical isomerism, and identify the chiral carbon atom with an asterisk (*).

[ 2 ]
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