An unknown compound with formula $C_n{H}_x{O}_2$ gives the IR spectrum shown below and has an $M^{+}$peak at $\frac{m}{z}128$ in its mass spectrum. Answer the questions that follow to identify the compound.

Part $1$ of $4$

What is the molecular formula of the compound?

Part: $\frac{1}{4}$

Part $2$ of $4$

What is the index of hydrogen deficiency or degree of unsaturation of the compound?

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