Discussion
The compound that contains the most acidic hydrogen is
Answer: B
The most acidic hydrogen is in ethyne, HC≡CH.
C-H acidity depends on how well the carbon holds the lone pair left behind. An sp carbon has 50% s character, so its lone pair sits close to the nucleus and the acetylide anion is relatively stable; ethyne has a pKa of about 25.
The C-H bonds in ethene and allene are on sp2 carbons (33% s character), and those in ethane on sp3 carbons (25%), so their conjugate bases are far less stable; ethene and ethane have pKa values of roughly 44 and 50. Allene's central carbon is sp, but it carries no hydrogen, so it does not help.
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