Iodoform test is not given by from Chemistry Aldehydes, Ketones

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591.

Iodoform test is not given by

  • 2-pentanone

  • ethanol

  • ethanal

  • 3-pentanone


D.

3-pentanone

Iodoform test is given by comrounds which have (CH3-CO-) group or  group. Hence, 2-pentanone, CH3CHO and C2H5OH  give this test. But 3-pentanone (CH3CH2COCH2CH3) does not give iodoform test.

(CH3COCH2CH2CH3) 2-pentanone + 3I2 + 4NaOH   CHI3iodoform (yellow ppt)  + CH3CH2CH2COONa + 3NaI + 3H2OCH3-CHO + 3I2ethanal + 4NaOH    CHI3iodoform (yellow ppt)  + HCOONa + 3NaI + 3H2OC2H5OH + 4I2 + 6NaOH    CHI3iodoform (yellow ppt)  + HCOONa + 5NaI + 5H2OCH3-CH2-CO-CH2-CH33-pentanone + I2 + NaOH    No reaction


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592.

The IUPAC name of 

  • 4-propoxy pentane

  • pentyl-propyl ether

  • 2-propoxy pentane

  • 2-pentoxy propane


593.

Cannizaro's reaction is not given by

  • CCl3CHO

  • CH3CHO

  • HCHO

  • C6H5CHO


594.

From which group the fats belong?

  • Carboxylic acids

  • Carbonyl

  • Ester

  • Fatty acids


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595.

Among the following, the formula of saturated fatty acid is

  • C17H29COOH

  • C17H35COOH

  • C17H31COOH

  • C17H33COOH


596.

2, 2-dichloropropane Aq. KOH  A Clemmensen reduction B, B is

  • propanol

  • propene

  • propane

  • ethane


597.

Ethyl methyl ketone is obtained by heating calcium salts of

  • formic acid + propionic acid

  • acetic acid + propionic acid

  • acetic acid only

  • acetic acid + methanoic acid


598.

CH3COOH when reacts with C,HOH gives a product. The same product is obtained by which reaction?

  • Acetic acid + methanol

  • Acetic anhydride + water

  • Acetic anhydride + ethanol

  • Acetamide + methanol


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599.

Glucose on reaction with Fehling solution gives

  • cupric oxide

  • cuprous oxide

  • saccharic acid

  • both (b) and (c)


600.

α- hydroxy propanoic acid has ........ asymmetric carbon atoms. 

  • 4

  • 3

  • 2

  • 1


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