The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is

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First ionization enthalpy generally increases across a period and decreases down a group. B has the lowest value here. In period 3, P has a stable half-filled 3p³ configuration, so IE₁(P) is slightly greater than IE₁(S). F is highest. Therefore, the increasing order is B < S < P < F; answer D.

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