Consider the reactions:

 

Identify A, X, Y and Z

  • Option 1)

    A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine.

  • Option 2)

    A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide.

  • Option 3)

    A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone.

  • Option 4)

    A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone.

 

Answers (1)

As we learnt in

Addition of ketones with alcohols -

Produces an unstable hemiketal intermediate and further stable compound called ketal.

- wherein

 

 and

Addition of ammonia and its derivatives with aldehydes and ketones -

Product formation is favoured due to rapid dehydration of the intermediate to form  > C = NG

G\:\:may\:be\:\:-OH,\:\:-NH_{2},\:\:-NHC_{6}H_{5},\:\:-NHCONH_{2},\:\:etc

- wherein

 

 

and

Aldol condensation -

Aldehydes and ketones possessing \alpha - hydrogen atom in the presence of dilute alkali undergo self-condensation to form  \beta - hydroxy aldehyde and

  \beta - hydroxy ketone.

- wherein

 

 X\rightarrow CH_{3}-CH_{2}-OH \ \ Y\Rightarrow CH_{3}-CH-CH-C^{II^{o}}-H

A\rightarrow CH_{3}-C^{II^{0}}-H \ \ Z\Rightarrow CH_{3}-CH=N-NH-C^{II^{0}}-NH_{2}

 


Option 1)

A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine.

this option is incorrect

Option 2)

A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide.

this option is incorrect

Option 3)

A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone.

this option is correct

Option 4)

A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone.

this option is incorrect

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