When 1,3-cyclopentadiene containing carbon-13 (¹³C) only at carbon-5 (as indicated by the asterisk in Fig. P15.72) is treated with potassium hydride (KH), a species X is formed and a gas is evolved. When the resulting mixture is added to water, a mixture of ¹³C-labeled 1,3-cyclopentadienes is formed as shown in the equation. Identify X, and explain both the origin and the percentages of the three labeled cyclopentadienes.

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* + K-H Figure P15.72 [X] + a gas H₂O * 20% +* 40% 40%