Step 1: Recall packing efficiency of close-packed structures.
For hcp, ccp, and fcc structures, the packing efficiency is 74%. All three are close-packed arrangements.
Step 2: Understand that fcc and ccp are the same.
CCP (cubic close packing, ABCABC stacking) and FCC (face-centred cubic unit cell) are just different descriptions of the identical structure. They must have the same packing efficiency.
Step 3: Evaluate statement A.
"Packing efficiency of hcp = ccp" - TRUE, both are 74%.
Step 4: Evaluate statement B.
"Packing efficiency of fcc is GREATER than ccp" - FALSE. FCC and CCP are the same structure, so their packing efficiencies are equal, not different.
Step 5: Evaluate statements C and D.
Statement C: fcc = ccp (TRUE). Statement D: hcp = fcc (TRUE). All three have 74% packing efficiency.
Step 6: Identify the incorrect statement.
Statement B is incorrect because fcc and ccp are the same arrangement. \[ \boxed{\text{Packing efficiency of fcc} > \text{packing efficiency of ccp (this statement is NOT correct)}} \]