Which one of the following is more acidic?

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(D) The acidity of hydrocarbons depends on the $s$-character of the hybridised carbon atom to which the hydrogen is attached.$1-$butyne $(CH_3-CH_2-C

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$1-$butyne

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(D) The acidity of hydrocarbons depends on the $s$-character of the hybridised carbon atom to which the hydrogen is attached.$1-$butyne $(CH_3-CH_2-C \equiv CH)$ contains a terminal hydrogen atom attached to an $sp$ hybridised carbon atom.Since $sp$ hybridised carbon has $50\% \ s$-character,it is more electronegative,making the $C-H$ bond more polar and the hydrogen more acidic.Butane $(sp^3)$,$1-$butene $(sp^2)$,and $2-$butyne (no acidic hydrogen) are significantly less acidic than $1-$butyne.

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Identify $Z$ in the following series of reaction:
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$CH_3-C \equiv CH \xrightarrow[dil. H_2SO_4]{HgSO_4} (A)$
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Products $(A)$ and $(B)$ can be differentiated by:

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