Which of the following has a stable intramolecular H-bond?

Trans-3-fluoropropenoic acid

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2-fluoropropenoic acid

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Cis-3-fluoropropenoic acid

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4-fluoro-3-methyl-3-pentenoic acid

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Solution

The correct option is C Cis-3-fluoropropenoic acid
Cis isomer of acyclic system is less stable than trans isomer. This is due to the steric hindrance between the terminal groups is always greater in Cis isomer than trans isomer.
When there is H-bonding arise in cis isomer, cis become more stable than trans form. Hence the correct answer is option (c).

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