Enter a clue or pattern or both:
The Clue
Flammable hydrocarbons (8 letter answer)
The Answer
PROPENES
Tags
Notes
The answer PROPENES is so rare that it appears less than once every 2500 puzzles.
Definition
PROPENE as a noun:
1. (propylene, propene) = a flammable gas obtained by cracking petroleum; used in organic synthesis