Which one of the following formulae does not | vedclass

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(D) The degree of unsaturation (or double bond equivalent) is calculated using the formula: $U = C + 1 - \frac{H + X - N}{2}$.For a stable organic com

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$C_4H_9O_4$

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(D) The degree of unsaturation (or double bond equivalent) is calculated using the formula: $U = C + 1 - \frac{H + X - N}{2}$.For a stable organic compound,the degree of unsaturation must be an integer ($0$,$1$,$2$,...).For $C_4H_{10}O_4$: $U = 4 + 1 - \frac{10}{2} = 0$.For $C_4H_8O_4$: $U = 4 + 1 - \frac{8}{2} = 1$.For $C_4H_7ClO_4$: $U = 4 + 1 - \frac{7+1}{2} = 1$.For $C_4H_9O_4$: $U = 4 + 1 - \frac{9}{2} = 0.5$.Since the degree of unsaturation cannot be $0.5$ for a stable organic molecule,$C_4H_9O_4$ does not represent a valid organic compound.

Which one of the following formulae does not represent an organic compound?

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