Question

Identify the following as alkanes, alkenes, cycloalkenes or alkynes.

a.

b.

c.

d.

Short answer

a. Cycloalkene

b. Alkene

c. Alkene

d. Alkyne

Step-by-step solution

Part (a) Given Information

Part (a) Explanation

• The given compound is cycloalkene.
• The name of the given compound is methyl cyclopropene.
• It is a cycloalkene i.e. a ring structure of carbon atoms containing a double bond, that is comprised of three carbon units (propene as a double bond between two carbon atoms) and methyl as a substituent.

Part (b) Given information

Part (b) Explanation

• The given compound is an alkene.
• Alkene is a hydrocarbon that consists of carbon and hydrogen atoms, containing a double bond between two carbon atoms.
• The name of the given alkene is hex-2-ene.
• The placement of two carbons is opposite to each other, thus it is named as trans-hex-2-ene.

Part (c) Given Information

Part (c) Explanation

• The given compound is an alkene.
• Alkene is a hydrocarbon that consists of carbon and hydrogen atoms, containing a double bond between two carbon atoms.
• The name of the given alkene is 2,3-dimethylalkene.

Part (d) Given Information

Part (d) Explanation

• The given compound is an alkyne.
• An alkyne is a hydrocarbon that is composed of carbon and hydrogen atoms, containing a triple bond between two carbon atoms.
• The name of the given compound is 3-cyclopentyl-propyne.