What do you think 1,5-pentanedithiol C5H12S would smell like

rotten egg smell

Explanation:

1,5-pentanedithiol (C₅H₁₂S) -

The compound have thiol as the functional group, and hence will show some characteristics of thiol group,

The thiol group is a - SH group, they are also called mercaptan functional group.

The thiol group has a strong characteristic smell of rotten egg.

And hence, the compound 1,5-pentanedithiol (C₅H₁₂S) can easily be distinguished by its rotten egg smell.