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If an alkene of molecular formula C9H18 on ozonolysis gives 2,2-dimethyl propanal and 2-butanon, then the alkene is:
  1. 2,2,4-trimethyl-3-hexene
  2. 2,2,6-trimethyl-3-hexene
  3. 2,3,4-trimethyl-2-hexene
  4. 2,2,4-trimethyl-2-hexene
Solution (A)
Description: 49417.png
On the basis of product formation, it would be alkene:
Description: 49478.png
Description: 49486.png Description: 52151.png
Description: 49495.png


The enol form of acetone after treatment with D2O gives:
  1. Description: 49504.png
  2. Description: 49512.png
  3. Description: 49520.png
  4. Description: 49531.png
Solution (B)
Description: 49543.pngDescription: 49577.png
Description: 49558.png
Description: 49566.png
Description: 49574.png
The enol form of acetone on treatment with D2O undergoes enolization, deutration (addition of D2O), and dehydration (removal of H2O). The repeated enolization, deutration, and dehydration ultimately give Description: 49592.png.


Which of the following has the most acidic hydrogen?
  1. 3-Hexanone
  2. 2,4-Hexanedione
  3. 2,5-Hexanedione
  4. 2,3-Hexanedione
Solution (B)
2,4-Hexanedione (a 1,3-diketone) has the most acidic hydrogen. This is because the carbanion left after the removal of H+ is resonance stabilized in this case.
Description: 49601.pngDescription: 49609.png
Description: 49617.pngDescription: 49625.png
Description: 49634.png


A compound containing only carbon, hydrogen, and oxygen has a molecular weight of 44. On complete oxidation, it is converted into a compound of molecular weight 60. The original compound is:
  1. an aldehyde
  2. an acid
  3. an alcohol
  4. an ether
Solution (A)
On complete oxidation, the obtained compound shows increment in molecular weight of only 16. It means only one oxygen atom is added here. This condition is fulfilled by only aldehyde which on oxidation gives acid.
Description: 49648.png
Hence, the original compound must be
Description: 49655.png


A compound has a vapor density of 29. On warming an aqueous solution of alkali, it gives a yellow precipitate. The compound is:
  1. Description: 49666.png
  2. Description: 49673.png
  3. Description: 49681.png
  4. Description: 49689.png
Solution (A)
Molecular weight of the compound Description: 49699.png Description: 49707.png
Molecular weight of Description: 49717.png, and Description: 49726.png are 58, 60, 58, and 74, respectively. Both Description: 49735.png and Description: 49745.png have molecular weight 58, but only aldehyde, i.e., Description: 49753.png on warming with aqueous alkali gives yellow precipitate.

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