A) acetylene contains least number of hydrogen atoms
B) acetylene has only one hydrogen atom at each carbon atom
C) acetylene belongs to the class of alkynes with formula\[{{C}_{n}}{{H}_{2n-2}}\]
D) sigma electron density of\[C-H\]bond in acetylene is nearer a carbon which has 50% \[s-\]character
Correct Answer: D
Solution :
In acetylene, carbon is in sp (50% 5, 50% p character) hybrid state. Due to very large\[s-\]character, the electrons in sp hybrid orbitals are held more tightly by the nucleus and consequently the electron pair of\[H-C=\]bond is displaced more towards the carbon atom and helps in release of\[{{H}^{+}}\]ion. Hence, terminal acetylene hydrocarbons are acidic in nature.
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