Which of the following acids on heating loses a molecule of $H_{2} O$ to form $α, β$ -unsaturated acid?

C H 3 C H O H C O O H

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H O C H 2 C O O H

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C H_{3} C H O H C H_{2} C O 0 H

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H O C H_{2} C H_{2} C H_{2} C O O H

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Solution

The correct option is A $C H 3 C H O H C O O H$
$O H$
$C H_{3} - | C H - C O O H$ looses a molecule of $H_{2} O$ to form $α, β$ - unsaturated acid.
$O H$
$C H_{3} - | C H - C O O H △ \to C H_{2} β = C H α - C O O H$

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X O_{3}, Z n / H_{2} O - ------ \to A [A g (N H_{3})_{2}]^{+} - ------- \to B

- C = C H - C | | O - O H

α - β

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