Pearson Edexcel IAL Chemistry 4.11 Alkane & cycloalkane isomers

Practise drawing, naming and counting alkane and cycloalkane isomers, especially small formulae where branching and rings matter.

Exam points

draw all alkane isomers up to six carbons using correct branching and no duplicate structures

[Maximum number: 3]

This question is about cycloalkanes.

(a)

The skeletal formula of cycloalkane D is shown.

Figure for Question (a) — Edexcel A-Level Chemistry AS

[ 1 ]

(i)

Give the name of D.

[ 1 ]

(b)

There are four structural isomers of $\mathrm{C}_{6} \mathrm{H}_{12}$ with a ring of four carbon atoms.

One of these isomers is shown, in the first box.
Complete the skeletal formulae of the other three isomers.

Table for Question (b) — Edexcel A-Level Chemistry AS

[ 2 ]

All 3 correct

- Any 2 correct

(2)

(1)

Examples of isomers:

Figure for Answer to Question (b) — Edexcel A-Level Chemistry AS

Allow isomers in any order

Allow $\mathrm{CH}_{3}$ and $\mathrm{C}_{2} \mathrm{H}_{5}$ for side chains

Ignore bond angles and bond lengths

Do not award any structure with 2 or more rings

(2)

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4.11—Draw and name the structural isomers of alkanes and cycloalkanes with up to six carbon atoms question 1

Question (a)

Question (i)

Question (b)