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Which one of the following orders of acid strength is correct?

1. RCOOH > HC ≡ CH > HOH > ROH
2. RCOOH > ROH > HOH > HC ≡ CH
3. RCOOH > HOH > ROH > HC ≡ CH
4. RCOOH > HC ≡ CH > ROH > HOH

Correct answer: RCOOH > HOH > ROH > HC ≡ CH

Solution

Carboxylic acids (RCOOH) are the strongest acids among the given options due to resonance stabilization of their conjugate base. Water (HOH) is more acidic than alcohols (ROH) because alcohols have an electron-donating alkyl group that reduces acidity. Alkynes (HC≡CH) are the least acidic due to the lack of resonance stabilization in their conjugate base.

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