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The ascending acidity order of the following H atoms is HC ≡ C H H 2 C CH H A B C H 3 C H 3 C H 3 C H C CH 2 H 3 C H D

1. D < C < B < A
2. A < B < C < D
3. C < D < B < A
4. A < B < D < C

Correct answer: C < D < B < A

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