2-pentanone and 3-methylbutenal

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These two compounds both have molecular formula C5H10O.

Compare properties:

......22-pentanone (methyl propyl ketone)...........................................3-methylbutanal (isovaleraldehyde)

0.809 . . . . . . . . . . . . . . . . relative density (liquid) . . . . . . . . . . . . . . . . 0.785

1.3895 . . . . . . . . . . . . . . . refractive index (liquid) . . . . . . . . . . . . . . . .1.3902

102 . . . . . . . . . . . . . . . . boiling point (oC) . . . . . . . . . . . . . . . . . . . . . . 92.5

- 70 . . . . . . . . . . . . . . . . . melting point (oC) . . . . . . . . . . . . . . . . . . . . . . - 51

almost insoluble. . . . . . . . . . . . . . solubility in water. . . . .. . . . . . . . . . . . . .sparingly soluble

What are these two materials used for?

MPK (methyl propyl ketone or 2-pentanone) is an organic solvent.

Isovaleraldehyde (3-methylbutanal) has a strong apple-like odour and is used in perfumes and flavours.