Pyroline or Pyrroline: How To spell?
The word Pyroline is misspelled against Pyrroline, a noun meaning "A nitrogenous base, C4H7N, obtained as a colorless liquid by the reduction of pyrrol."
Pyrroline has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings py & oline which should not be misspelled with single 'R'
Wrong Spelling:  py-r-oline  Correct Spelling:  py-rr-oline 
Find more incorrect spellings of Pyrroline to spell right way.