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Physical Properties of Haloarenes

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Question

The following hydrogen halides ( $H F, H C l, H B r$ and $H I$ ) are all polar molecules. The strength of the acid each forms in water is based on which of the following?
$I$ . The polarity of the molecule
$I I$ . The size of the molecule
$I I I$ . The strength of the bond

A

I

only

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B

I I

only

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C

I I I

only

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D

I

and

I I I

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E

I I

and

I I I

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Solution

The correct option is E $I I I$ only
The order of acidic character can be explained in terms of strength of $H - X$ bonds, which is in the order $H - I < H - B r < H - C l < H - F .$ Since $H - I$ bond is weakest, therefore, HI is the strongest acid. On the other hand H-F bond is strongest, hence it is the weakest acid among all the halogen acids.

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