C- coagulative necrosis, which is the type that occurs in myocardial infarct. I remember this because when I think coagulation I think bloody. This can also happen in liver or kidney, i.e. very vascular organs.
Liquifactive is when the tissue is liquified or mushy, and usually occurs in brain.
Caseous means "cheeselike", and you can usually see this in lungs infected with TB.
Enzymatic fat is when the damage to the pancreas cause it to leak lipases, so the pancreas digests itself and nearby tissues, such as intestines.
Gangrenous usually occurs in the setting of a would infection and affects limbs (think diabetic foot) or GI.