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Question
Structural formula of ethyne is
Options
`"H" - "C" ≡ "C "- "H"`
`"H"_3-"C" ≡ "C" - "H"`
Solution
`"H" - "C" ≡ "C "- "H"`
The formula of ethyne is C2H2. There is one triple bond between carbon atoms.
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\[\begin{array}{cc}
\phantom{}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{}\\
\ce{H - C - C - C - C - C - C - C = O}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{.....}\\
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\end{array}\]
