1. Aldehydes

2. Aldehydes
 Methanal
HCHO
 Ethanal
CH3CHO
 Propanal
C2H5CHO
 Butanal
C3H7CHO

3. Methanal

4. Ethanal

5. Propanal

6. Butanal

7. Physical properties
 Physical
state: Liquid, except methanal,
which is a gas at room temperature
 Boiling points higher than the corresponding
alkanes, due to polar δ+C = Oδ- group, but
lower than the corresponding alcohols

8. Physical properties
 Short
chain aldehydes are soluble in
water due to the polar carbonyl group
 As
the number of carbon atoms in a
molecule of the ester increases, solubility in
water decreases, while solubility in
cyclohexane increases

9. Benzaldehyde
 Aromatic
aldehyde
 Found in almond
kernels

10. Benzaldehyde
 Aromatic
aldehyde
 Found in almond
kernels