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(A) The structure of $but-1-yne$ is $CH \equiv C-CH_2-CH_3$. In terminal alkynes,the hydrogen atom attached to the $sp$-hybridized carbon atom is acid

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$1$

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(A) The structure of $but-1-yne$ is $CH \equiv C-CH_2-CH_3$. In terminal alkynes,the hydrogen atom attached to the $sp$-hybridized carbon atom is acidic in nature because of the high electronegativity of the $sp$ carbon. In $but-1-yne$,there is only $1$ such acidic hydrogen atom. Therefore,$1 \ mole$ of $but-1-yne$ can easily donate $1 \ mole$ of protons ($H^+$ ions).

The number of moles of protons which can be easily given by $1 \ mole$ of $but-1-yne$ is:

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