Identify the alkyne in the following sequence of reactions. \( \mathrm{CH}_{2}=\mathrm{CH}_{2} \...

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Identify the alkyne in the following sequence of reactions. \( \mathrm{CH}_{2}=\mathrm{CH}_{2} \)
(a) \( \mathrm{H}_{3} \mathrm{C}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{3} \)
(b) \( \mathrm{H}_{3} \mathrm{C}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{CH} \)
(c) \( \mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{C} \equiv \mathrm{CH} \)
(d) \( \mathrm{HC} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{CH} \)
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