Arrange the following elements in the increasing order of their bindi…

The correct answer is Option (3) → B, A, C, D

Among light nuclei the binding energy per nucleon rises with mass number, but not smoothly: nuclei built of alpha-particle units, such as ⁴He and ¹²C, are unusually tightly bound. Approximate values:

    \( {}^{6}\mathrm{Li} \text{ (B)}: 5.3\,\mathrm{MeV} \)
    \( {}^{4}\mathrm{He} \text{ (A)}: 7.1\,\mathrm{MeV} \)
    \( {}^{14}\mathrm{N} \text{ (C)}: 7.5\,\mathrm{MeV} \)
    \( {}^{12}\mathrm{C} \text{ (D)}: 7.7\,\mathrm{MeV} \)

Increasing order: ⁶Li < ⁴He < ¹⁴N < ¹²C, that is, B, A, C, D.