Elements | $ΔH_{1}$ | $ΔH_{2}$ | $Δ_{eg}$H |

I | 520 | 7300 | -60 |

II | 419 | 3051 | -48 |

III | 1681 | 3374 | -328 |

IV | 1008 | 1846 | -295 |

V | 2372 | 5251 | +48 |

VI | 738 | 1451 | -40 |

Which of the above elements is likely to be :

(a) the least reactive element,

(b) the most reactive metal,

(c) the most reactive non-metal,

(d) the least reactive non-metal,

(e) the metal which can form a stable binary halide of the formula MX

$_{2}$ (X=halogen) and

(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?