IB Chemistry HL 3.2.4 Physical property trends and structural evidence Question Bank

Practise IB Chemistry HL 3.2.4 by analysing how structure, intermolecular forces and branching jointly determine organic properties.

Exam points

Analyse competing effects of chain length, branching, unsaturation and polarity on a physical property.
Use structural evidence to rank isomers or related compounds by boiling or melting point.
Evaluate a separation or processing decision using intermolecular-force and volatility evidence.

[Maximum number: 2]

Alkenes, such as A (shown below), are important intermediates in the petrochemical industry because they undergo addition reactions to produce a wide variety of products, such as the conversion shown below.

Figure for Question 3.2.4—Physical property trends question 1 — IB Chemistry HL

In the gas phase, A reacts with hydrogen to form D :

Compound D is isomeric with hexane. Predict, giving reasons, how the boiling points of these compounds would compare.

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3.2.4—Physical property trends question 1