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Chapter 5: Problem 198

Match the elements of Column I to elements of Column II. There can be single or multiple matches. Column I (a) Cannizzaro reaction (b) Perkin reaction (c) Kolbe reaction (d) \(\mathrm{CH}_{3}-\mathrm{CHO}+\mathrm{NaOH}\) Column II (p) Crotonaldehyde (q) Carbanion intermediate (r) Electrophilic substitution (s) Disproportionation (t) Formation of new carbon-carbon bond.

Short Answer

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Question: Match the elements of Column I to the elements of Column II. Column I: (a) Cannizzaro reaction (b) Perkin reaction (c) Kolbe reaction (d) \(\mathrm{CH}_{3}-\mathrm{CHO}+\mathrm{NaOH}\) Column II: (q) Carbanion intermediate (s) Disproportionation (t) Formation of new carbon-carbon bond Answer: - (a) Cannizzaro reaction: (s) Disproportionation - (b) Perkin reaction: (t) Formation of new carbon-carbon bond - (c) Kolbe reaction: (q) Carbanion intermediate - (d) \(\mathrm{CH}_{3}-\mathrm{CHO}+\mathrm{NaOH}\): (s) Disproportionation

Step by step solution

01

Understanding the Cannizzaro reaction

The Cannizzaro reaction involves the base-induced disproportionation of a non-enolizable aldehyde to produce a carboxylic acid (oxidation) and a primary alcohol (reduction) simultaneously.
02

Match the Cannizzaro reaction

The Cannizzaro reaction matches with the following element in Column II: - (s) Disproportionation: As it is the main characteristic of the reaction, involving the oxidation and reduction processes.
03

Understanding the Perkin reaction

The Perkin reaction is an organic reaction used to synthesize cinnamic acids, which involves the reaction between an aromatic aldehyde and an anhydride in the presence of an alkali salt of an acid, followed by acid hydrolysis. It results in the formation of a new carbon-carbon bond.
04

Match the Perkin reaction

The Perkin reaction matches with the following elements in Column II: - (t) Formation of new carbon-carbon bond: As the reaction allows the construction of a new C-C bond between the aromatic aldehyde and the anhydride.
05

Understanding the Kolbe reaction

The Kolbe reaction, also known as the Kolbe-Schmitt reaction, involves the synthesis of salicylic acid through the reaction of phenol with carbon dioxide under high pressure and temperature, in the presence of a base catalyst. This reaction proceeds through a carbanion intermediate.
06

Match the Kolbe reaction

The Kolbe reaction matches with the following element in Column II: - (q) Carbanion intermediate: As it is formed during the course of the reaction and is crucial for the formation of salicylic acid.
07

Identify the given reaction

The given reaction in Column I is: \(\mathrm{CH}_{3}-\mathrm{CHO}+\mathrm{NaOH}\) This represents the Cannizzaro reaction, as it involves a non-enolizable aldehyde reacting with a base, \(\mathrm{NaOH}\).
08

Match the given reaction

The given reaction (d) matches with the following element in Column II: - (s) Disproportionation: Since it is a Cannizzaro reaction, the main characteristic is the disproportionation involving the oxidation of the aldehyde to a carboxylic acid and the reduction to a primary alcohol. To sum up, the matching is as follows: - (a) Cannizzaro reaction: (s) Disproportionation - (b) Perkin reaction: (t) Formation of new carbon-carbon bond - (c) Kolbe reaction: (q) Carbanion intermediate - (d) \(\mathrm{CH}_{3}-\mathrm{CHO}+\mathrm{NaOH}\): (s) Disproportionation

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Most popular questions from this chapter

Tollens' reagent is reduced by (a) methanoic acid (b) ethanal (c) benzaldehyde (d) all the above

Malonic acid on heating at \(430 \mathrm{~K}\) yields (a) formic acid (b) succinic acid (c) acetic acid (d) lactic acid

Statement 1 2-methylpropanal undergoes Cannizzaro reaction when heated with \(50 \% \mathrm{NaOH}\) solution at about \(443-473 \mathrm{~K}\). and Statement 2 2-Methylpropanal contains an \(\alpha\) -hydrogen atom.

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