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Which has lowest bond energy (single bond)?
  • a)
    O—H
  • b)
    O—O
  • c)
    S—H
  • d)
    S—S
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which has lowest bond energy (single bond)?a)O—Hb)O—Oc)S&#...
Sulfur atoms are larger than oxygen atoms.

Pi bonds are formed by overlapping of two parallel p orbitals. The further the distance between atoms, the lesser the overlapping and weaker the bond.

But sigma bonds in case of Oxygen and Nitrogen are not strong enough because you are bringing two very small atoms (with large no. of electrons in the outer shell) too close which makes the sigma bond comparatively unstable than that of S-S bond where sigma bond is more stable due to lesser electro static repulsion of non-bonding electrons.
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Most Upvoted Answer
Which has lowest bond energy (single bond)?a)O—Hb)O—Oc)S&#...
Because a) and c) are polar compound and polar compound have high bond dissociation energy. And in S-S S have bigger size so energy is less.
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Community Answer
Which has lowest bond energy (single bond)?a)O—Hb)O—Oc)S&#...
Presence of lone pairs on bonded atoms generally lowers the bond energy.
Bond energy order is
O—O (146) < (S—S) (266) < S—H(366) < O—H(464) kJ/mol
 
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