CI-Cl Bond distance is 5.63 A, while the NaCl bond distance is

Explanation

Option A is correct since, in a chlorine molecule, chlorine exists as atoms. So the Cl-Cl bond distance becomes double the radius of each chlorine atom. When Na is compared with Cl, the radius of Na is approximately double the radius of the chlorine atom. When Na+ is formed, the radius of the Na atom becomes almost half the radius of Na, and the radius of Cl- becomes almost double the radius of the Cl atom. So, when these two atoms with their respective radii are attracted to each other, the bond distance is half of the Cl-Cl bond distance. Option B is incorrect since the Na-Cl bond distance cannot be double the Cl-Cl bond distance. Option C is incorrect since the Na-Cl bond distance cannot be equal to the Cl-Cl bond distance. Option D is incorrect since it states none of these, which is not the case.