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Base strength of: (A) H3C−CH2, (B) H2C≡CH, and (C) H−C≡C is in the order of

1. (B)>(A)>(C)
2. (C)>(B)>(A)
3. (A)>(C)>(B)
4. (A)>(B)>(C)

Correct answer: (A)>(C)>(B)

Solution

The base strength depends on the availability of the lone pair of electrons for donation. (A) is an alkyl group, which is electron-donating, making it the strongest base. (C) has a negative charge on a sp-hybridized carbon, which is more electronegative, making it less basic than (A). (B) is the least basic due to the sp-hybridized carbon in the triple bond pulling electron density away.

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