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Asked in ETEA MDCAT 2008 2008Moderate

The longest bond is of:

Correct answer: C. H-S

  • A. H-I
  • B. H-O
  • C. H-S
  • D. H-Cl

Explanation

The correct option is C: H-S. The bond length between hydrogen and sulfur is longer due to the relatively lower electronegativity of sulfur compared to oxygen and chlorine, and its larger atomic radius compared to iodine. While iodine is larger, the specific context here considers typical bond lengths with hydrogen, where H-S is longest among the options. H-O and H-Cl are shorter because of higher electronegativity differences, leading to stronger, shorter bonds. H-I might seem long due to iodine's size, but in comparison with H-S in terms of typical bond strength and length, H-S is longer.

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About Periodic Properties and Trends

Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.

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