A) Methane
B) Ethane
C) Ethyne
D) Ethene
Correct Answer: C
Solution :
Terminal alkynes have acidic H because C?H bond has ionic character due to resonance \[\overset{+}{\mathop{H}}\,-\bar{C}\equiv C-H\underset{{}}{\longleftrightarrow}\overset{+}{\mathop{H}}\,-\bar{C}\equiv \bar{C}-\overset{+}{\mathop{H}}\,\]\[H-C=C-H\underset{{}}{\longleftrightarrow}H-C=\bar{C}-\overset{+}{\mathop{H}}\,\underset{{}}{\longleftrightarrow}\] Greater the s-character of carbon atom greater the electronegativity and hence greater the attraction for electrons. Proton release, therefore, is maximum in ethyne\[(HC\equiv CH).\]
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