Which one of the following on heating gives unsaturated acid?

α -

Hydroxy acid

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β -

Hydroxy acid

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γ -

Hydroxy acid

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δ -

Hydroxy acid

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Solution

The correct option is B $β -$ Hydroxy acid
Hydroxy acid on heating loses a molecule of water to give unsaturated acid. The carbon-carbon double bond is in conjugation with carbon oxygen double bond.
$R C H (O H) C H_{2} C O O H h e a t - - \to R C H = C H C O O H + H_{2} O$

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The IUPAC name of $β$ -ethoxy- $α$ -hydroxy propanic acid is

β

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