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2020 H2 Chem P1 Q17 — Introduction to Organic Solution

Introduction to Organic 2020 A-Level H2 Chemistry · Paper 1 · Q17

Question

Which statement is correct to describe constitutional isomers?

A\(\text{C}_4\text{H}_{10}\) has three constitutional isomers.
BBut-1-ene and pent-1-ene are examples of constitutional isomers.
CConstitutional isomers may differ in their chemical properties.
DConstitutional isomers may have different molecular formulae.

Correct answer: C

Video Solution

Explanation

A Incorrect.
\(\text{C}_4\text{H}_{10}\) has two constitutional isomers: butane and 2-methylpropane.

B Incorrect.
But-1-ene (\(\text{C}_4\text{H}_8\)) and pent-1-ene (\(\text{C}_5\text{H}_{10}\)) have different molecular formula and are not isomers.

C Correct.
One type of constitutional isomers is functional group isomers, which may undergo different chemical reactions.

D Incorrect.
Isomers are molecules with the same molecular formula

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