Answer.

Both 2-hexene and 3-hexene can have cis and trans geometric isomers.

For 2-hexene the trans isomer is shown below and is called trans-2-hexene.

For 2-hexene the cis isomer is shown below and is called cis-2-hexene.

For 3-hexene the trans isomer is shown below and is called trans-3-hexene.

For 3-hexene the cis isomer is shown below and is called cis-3-hexene.

If you got all these you have a good understanding of alkenes, and geometric isomers.