Boric acid is a very weak acid but in the presence of certain organic compounds, it acts as a strong acid. Which one of the following organic compound(s) cannot affect such change?

Glycerol

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Acetic acid

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Ethyl alcohol

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Ethylene

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Solution

The correct options are
A Ethyl alcohol
C Acetic acid
D Ethylene

Option (B),(C),(D) are correct.
Boric acid forms a stable cyclic complex with polyhydroxy compounds like glycerol. This helps in the release of $H^{+}$ as $H_{3} O^{+}$ and therefore boric acid acts as a strong acid. This is not possible with compounds such as acetic acid, ethyl alcohol and ethylene.

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