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Correct order is:

1. H–C≡C–H > H3C–C≡C–H > H2C
2. CH2 > CH3–CH3
3. Two acidic hydrogens > One acidic hydrogen
4. H–C≡C–CH3 > CH2 > CH3–CH3

Correct answer: H–C≡C–H > H3C–C≡C–H > H2C

Solution

The correct order is based on the acidity of the compounds. Terminal alkynes (H–C≡C–H) are more acidic than internal alkynes (H3C–C≡C–H) due to the availability of acidic hydrogen. Alkenes (H2C) are less acidic than alkynes.

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