Question

As per Bronsted-Lowry concept, acid is defined as:

• A. Electron pair acceptor
• B. Any substance/molecule that can accept a proton
• C. Any substance/molecule that can donate a proton
• D. Electron pair donor

Answer 1

The Correct Option is C

In the Bronsted-Lowry framework, every acid-base reaction is viewed as a proton transfer between a conjugate pair. The species that gives away the proton becomes the conjugate base, while the species receiving it becomes the conjugate acid, and by this logic the original acid must be the proton donor and the original base the proton acceptor. The two "electron pair" options belong to the separate Lewis theory, which frames acid-base behaviour in terms of electron pairs rather than protons, and the "accepts a proton" option actually flips the roles and describes a base instead.

Therefore, the correct answer is Any substance/molecule that can donate a proton.