Treatment of compound E (molecular formula C4H8O2) with...

Treatment of compound $\textbf{E}$ (molecular formula C$_4$H$_8$O$_2$) with excess CH$_3$CH$_2$MgBr yields compound $\textbf{F}$ (molecular formula C$_6$H$_{14}$O) after protonation with H$_2$O. $\textbf{E}$ shows a strong absorption in its IR spectrum at 1743 cm$^{-1}$. F shows a strong IR absorption at 3600-3200 cm$^{-1}$. The $^1$H NMR spectral data of $\textbf{E}$ and $\textbf{F}$ are given. What are the structures of $\textbf{E}$ and $\textbf{F}$? Compound $\textbf{E}$ signals at 1.2 (triplet, 3 H), 2.0 (singlet, 3 H), and 4.1 (quartet, 2 H) ppm Compound $\textbf{F}$ signals at 0.9 (triplet, 6 H), 1.1 (singlet, 3 H), 1.5 (quartet, 4 H), and 1 .55 (singlet, 1 H) ppm

Treatment of compound $\textbf{E}$ (molecular formula C$_4$H$_8$O$_2$) with excess CH$_3$CH$_2$MgBr yields compound $\textbf{F}$ (molecular formula C$_6$H$_{14}$O)
after protonation with H$_2$O. $\textbf{E}$ shows a strong absorption in its IR spectrum at 1743 cm$^{-1}$. F shows a strong IR absorption at 3600-3200 cm$^{-1}$. The $^1$H NMR spectral data of $\textbf{E}$ and $\textbf{F}$ are given. What are the structures of $\textbf{E}$ and $\textbf{F}$?
Compound $\textbf{E}$ signals at 1.2 (triplet, 3 H), 2.0 (singlet, 3 H), and 4.1 (quartet, 2 H) ppm
Compound $\textbf{F}$ signals at 0.9 (triplet, 6 H), 1.1 (singlet, 3 H), 1.5 (quartet, 4 H), and 1 .55 (singlet, 1 H) ppm

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