IB Chemistry SL 3.2.1 Organic Formulas Questions

Use real exam questions to convert between molecular, empirical and structural formulas and draw correct organic representations.

Exam points

Convert a molecular formula to its simplest empirical formula by reducing atom ratios correctly.
Draw or identify a full, condensed, displayed or skeletal structural formula from a name, molecular formula or reaction context.
Select the correct organic representation and preserve atom connectivity, functional groups and stereochemical information when interconverting formulas.

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Study 3.2.1—Organic formulas conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 2]

Strychnine, $\mathrm{C}_{21} \mathrm{H}_{22} \mathrm{~N}_{2} \mathrm{O}_{2}\left(M_{\mathrm{r}}=334.4\right)$ , is a white crystalline solid obtained from plants.

(a)

The formula of strychnine is:

Figure for Question (a) — IB Chemistry SL

[ 2 ]

(i)

State the type of structural formula shown.

[ 1 ]

(ii)

State the number of rings in strychnine's structure.

[ 1 ]

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IB Chemistry SL 3.2.1 Organic Formulas Questions question 1

Question (a)

Question (i)

Question (ii)