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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12008822
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Explain why O-hydroxy benzaldehyde is a liquid at room temperature while p- hydroxy benzaldehyde is a high melting solid.

Solution

Due to intramolecular H-bonding in O-hydroxy benzaldehyde exists as discrete molecule whereas due to intermolecular H-bonding p-hydroxy benzaldehyde exist as associated molecules. To break this intermolecular H-bonds a large amount of energy is needed. Consequently P-isomer has a much higher m.p. and b.p. than that of O-isomer. As a result O-hydroxy benzaldehyde is liquid.

Some More Questions From Aldehydes, Ketones and Carboxylic Acids Chapter

Write the structures of the following compounds.
2-Hydroxycyclopentane carbaldehyde

Write the structures of the following compounds.
4-oxopentanal    

Write the structures of the following compounds.
Di-sec-butyl ketone

Write the structures of the following compounds.
4-fluoro acetophenone.

Write the structures of the following reactions:

Write the structures of products of the following reactions:


    

Arrange the following compounds in increasing order of their boiling points:
CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3.

Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions:    
Ethanal, Propanal, Propanone, Butanone.

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