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Asked in KMU Centralized Admission Test 2021 2021

Which of the following is strongest Lewis base?

Correct answer: B. Acetylene

  • A. Ethylene
  • B. Acetylene
  • C. Benzene
  • D. All have equal strength

Explanation

Acetylene (ethyne) has a triple bond between the carbon atoms, allowing it to donate a pair of electrons more readily compared to ethylene.Therefore, it is the strongest Lewis base among the options given.

This question appeared on the KMU Centralized Admission Test 2021 paper, which you can sit online with every answer explained.

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About Bronsted-Lowry and Lewis Concepts

The Brønsted-Lowry concept defines acids as proton donors and bases as proton acceptors, producing conjugate acid-base pairs. The Lewis concept extends the idea to electron-pair acceptors and donors, so compounds such as BF3 and NH3 can be treated as acid and base even without proton transfer, unlike the Arrhenius definition.

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