Chemistry - GOC Question with Solution | TestHub
ChemistryGOCAcid BaseMedium2 minQB
ChemistryMediumsingle choice
Predict the direction of the following equilibrium and the approximate value of Keq.
CH₃Li + (CH₃)₂C=CH₂ CH₄ + (CH₃)₂C=CHLi (pKa : alkene vinyl H = 44, CH₄ = 50)
Options:
Answer:
C
Solution:
The acid on the left is the vinyl C-H of isobutylene (pKa 44) and the acid on the right is methane (pKa 50). Methane is the weaker acid, so the equilibrium lies to the right : methyl lithium is basic enough to vinylically deprotonate the alkene. Keq ≈ 10⁵⁰⁻⁴⁴ = 10⁶·
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Acid Base
⏱ 2mℹ️ Source: QB
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