Chalenging or Challenging: How To spell?
The word Chalenging is misspelled against Challenging, which is present continuous of "Challenge"
Challenging has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings cha & enging which should not be misspelled with single 'L'
Wrong Spelling:  cha-l-enging  Correct Spelling:  cha-ll-enging 
Find more wrongly spelled words of Challenging to spell it well.