Chemistry - GOC Question with Solution | TestHub
ChemistryGOCAcid BaseEasy2 minQB
ChemistryEasysingle choice
Which gas is evolved in the following reaction?
Phenol + NaH sodium phenoxide + gas
Options:
Answer:
A
Solution:
NaH is a very strong base (conjugate acid H₂, pKa ≈ 35) and phenol is far more acidic than H₂ (pKa ≈ 10), so the hydride ion removes the phenolic proton and hydrogen gas is evolved. Note that phenol is too weak to react with NaHCO₃, but reacts readily with NaH.
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Acid Base
⏱ 2mℹ️ Source: QB
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