Draw but-2-yne

How this exercise works

1. Open the exercise in the editor and draw the structure: drag from dot to dot to draw bonds, and tap a bond or an atom to change it.
2. Press Check answer. Equivalent drawings are accepted, and a mistake such as a missing carbon or a misplaced group is explained.
3. Stuck? Hints reveal the structure step by step, and the worked answer explains the name.

This exercise has 3 hints and a worked answer.

How to read a name like this

The ending -ene means a C=C double bond and -yne a C≡C triple bond; -diene and -diyne mean two of them. The locant in front of the ending is the first carbon of the multiple bond: a double bond with the locant 2 joins C2 and C3.

The chain is numbered so that the multiple bonds get the lowest locants before any substituent is considered. Prefixes and their locants then work as in alkanes.

Draw the multiple bond as two or three lines between the right carbons, and keep the two carbons of a triple bond and their neighbors on a straight line.

Learn the naming rules

The guide Alkenes and alkynes explains the names in this topic, with worked examples.

All the exercises of this family, with a short summary of its naming rules: Nomenclature practice: Alkenes and alkynes.

More exercises: Alkenes and alkynes

• Draw but-1-ene
• Draw pent-1-yne
• Draw cyclohexene
• Draw buta-1,3-diene
• Draw 2-methylbut-2-ene
• Draw 2-methylbuta-1,3-diene
• Draw 2,3-dimethylbut-2-ene
• Draw 4-methylpent-2-yne
• Draw hexa-1,5-diene
• Draw 1-methylcyclohex-1-ene
• Draw 3-ethylpent-2-ene
• Draw 3,3-dimethylbut-1-yne
• Draw pent-1-en-4-yne
• Draw 3,3-dimethylcyclohex-1-ene
• Draw 3-methylcyclohex-1-ene
• Draw 2-methylhex-1-en-3-yne
• Draw 1,3-dimethylcyclohex-1-ene

Practice the whole topicName the structures of this topic

Have a structure of your own?

Draw it on the free drawing page and see its name, formula and functional groups as you draw.