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Q8.7(viii):
Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation and Cannizzaro reaction. (viii) Butan-1-ol

Solution :

Step 1: Chemical Structure Analysis

The compound provided is Butan-1-ol. Its structural formula is $CH_3-CH_2-CH_2-CH_2-OH$.

Analytical identification:

  • Functional Group: Hydroxyl group ($-OH$) attached to a primary carbon.
  • Classification: Primary Alcohol.
  • Reactivity profile: Aldol condensation and Cannizzaro reaction are characteristic reactions of carbonyl compounds (aldehydes and ketones) containing an electrophilic carbonyl carbon ($C=O$).

Step 2: Evaluating Reaction Criteria

To determine if the compound undergoes these reactions, we apply the following criteria:

Reaction Type Requirement Applicability to Butan-1-ol
Aldol Condensation Presence of at least one $\alpha$-hydrogen atom in an aldehyde or ketone. No. It is an alcohol, not a carbonyl compound.
Cannizzaro Reaction Aldehydes lacking $\alpha$-hydrogen atoms, reacting with concentrated alkali. No. It is an alcohol, not an aldehyde.

Step 3: Logical Conclusion

Since Butan-1-ol lacks a carbonyl group ($C=O$), it cannot function as a substrate for either Aldol condensation or the Cannizzaro reaction. These reactions are specific to the nucleophilic addition-elimination mechanisms or disproportionation pathways exclusive to aldehydes and ketones [Per the mechanism of nucleophilic addition to carbonyls].

Structure of Butan-1-ol: H3C — CH2 — CH2 — CH2 — OH (Note: Absence of C=O group renders compound inert to stated reactions)

Final Solution: Butan-1-ol undergoes neither aldol condensation nor the Cannizzaro reaction because it is an alcohol and does not contain a carbonyl ($C=O$) functional group required for these transformations.


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