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Q.

The correct order of reactivity of hydrogen halides with ethyl alcohol is

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a

HCl>HBr>HF>HI

b

HF>HCl>HBr>HI

c

HBr>HCl>HI>HF

d

HI>HBr>HCl>HF

answer is D.

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Detailed Solution

  • The correct order of reactivity of hydrogen halides with ethyl alcohol is HI > HBr > HCl > HF. 
  • This is because the strength of the hydrogen-halogen bond decreases down the group from fluorine to iodine. 
  • Therefore, hydrogen iodide (HI) has the weakest hydrogen-halogen bond and is the most reactive towards nucleophiles like ethyl alcohol. 
  • On the other hand, hydrogen chloride (HCl) has the strongest hydrogen-halogen bond and is the least reactive towards nucleophiles.
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