My molar which got root canalled recently was chipped 1/4 of its size when i accidentaly bit a bone, what kind of procedure can be done? crown?

Full cusp coverage: And this is precisely why all back chewing teeth need full cusp coverage. A crown or a full onlay are good choices.

Crown: It's possible the tooth can be capped. See your dentist.

Crown and root canal: Yes. You need to make sure it did not break too much and get the crown asap to prevent loss of the tooth. The crown is usually recommended within a short time period after the root canal because of the likelihood of it chipping or breaking. Get back to your dentist and start the crown treatment.

Crown: Losing 1/4 of tooth is serious, depending on which area is lost. If the tooth is not cracked far below the bone, then a crown will likely correct the problem.

Depends: Depends on tooth structure left and whether pulp involved. Would range from crown, to crown/root canal, to extraction if fracture below gum line. Let your dentist advise you.