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Keto-enol Tautomerism

Explain why ...

Question

Explain why $o - h y d r o x y$ benzaldehyde is a liquid at room temperature while $p - h y d r o x y$ benzaldehyde is a high melting solid.

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Solution

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$o - h y d r o x y$ benzaldehyde involves intramolecular hydrogen bonding hence it is a liquid because its intramolecular forces is low.

On the other hand, $p - h y d r o x y$ benzaldehyde involves intermolecular hydrogen bonding and therefore it is solid.

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Q. o-Hydroxy benzaldehyde is a liquid at room temperature while p-hydroxy benzaldehyde is a_____ melting solid.

Q. Assertion :Both o-hydroxy benzaldehyde and p-hydroxy benzaldehyde have same molecular weight and show H-bonding. Reason: Melting point of p-hydroxy benzaldehyde is more than o-hydroxy benzaldehyde.

Q. Explain why o-hydroxybenzenaldehyde is liquid at room temperature while p-hydroxybenzenaldehyde has a high melting point

Q. o-Hydroxybenzaldehyde is a liquid at room temperature while p-hydroxybenzaldehyde is a high melting solid because of:

Q. In which case first has higher solubility than second?
(I) Phenol, Benzene
(II) Nitrobenzene, Phenol
(III) o-Hydroxybenzaldehyde, p-Hydroxy benzaldehyde
(IV)

C H_{3} C H O, C H_{3} - O - C H_{3}

(V) o-Nitrophenol, p-Nitrophenol

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Keto-enol Tautomerism

Standard XII Chemistry

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