Which one of the following reactions will not yield propionic acid ?

Question

What is the IUPAC name for the compound \( \text{CH}_3 - \text{CH(OH)} - \text{CH}_2 - \text{CHO} \)?

Answer 1

To solve the given problem of which reaction will not yield propionic acid (CH₃CH₂COOH), let's analyze each provided option:

CH₃CH₂CH₃ + KMnO₄(Heat), OH^-/H₃O⁺
- Propan-1-yl (CH₃CH₂CH₃) subjected to strong oxidation with KMnO₄ does not usually yield propionic acid. Instead, alkanes typically undergo oxidation to form a mixture of products including carbon dioxide and water, rather than a specific carboxylic acid, especially when heated and oxidized aggressively like in this condition.
CH₃CH₂CCl₃ + OH^-/H₃O⁺
- This is a typical haloform reaction. The trichloromethyl group (CCl₃) in a haloform reaction specifically leads to the formation of a carboxylic acid from the homologous ketone. This can yield propionic acid from precursors containing the appropriate alkyl groups.
CH₃CH₂COCH₃ + OI^-/H₃O⁺
- This reaction represents the oxidation of a ketone (2-butanone) using typical conditions that can oxidize alpha-hydroxy ketones to their corresponding carboxylic acids. This should yield propionic acid through oxidative cleavage and formic acid as a byproduct.
CH₃CH₂CH₂Br + Mg, CO₂ dry ether/H₃O⁺
- This describes the Grignard reaction. CH₃CH₂CH₂Br reacted with Mg in dry ether forms a Grignard reagent. Reacting with CO₂ and further hydrolyzation with acid typically leads to the formation of propionic acid.

Considering the explanations above, the reaction described in option 1 does not directly form propionic acid. Thus, the answer is:

CH₃CH₂CH₃ + KMnO₄(Heat), OH^-/H₃O⁺

Answer 2

To solve the given problem of which reaction will not yield propionic acid (CH₃CH₂COOH), let's analyze each provided option:

CH₃CH₂CH₃ + KMnO₄(Heat), OH^-/H₃O⁺
- Propan-1-yl (CH₃CH₂CH₃) subjected to strong oxidation with KMnO₄ does not usually yield propionic acid. Instead, alkanes typically undergo oxidation to form a mixture of products including carbon dioxide and water, rather than a specific carboxylic acid, especially when heated and oxidized aggressively like in this condition.
CH₃CH₂CCl₃ + OH^-/H₃O⁺
- This is a typical haloform reaction. The trichloromethyl group (CCl₃) in a haloform reaction specifically leads to the formation of a carboxylic acid from the homologous ketone. This can yield propionic acid from precursors containing the appropriate alkyl groups.
CH₃CH₂COCH₃ + OI^-/H₃O⁺
- This reaction represents the oxidation of a ketone (2-butanone) using typical conditions that can oxidize alpha-hydroxy ketones to their corresponding carboxylic acids. This should yield propionic acid through oxidative cleavage and formic acid as a byproduct.
CH₃CH₂CH₂Br + Mg, CO₂ dry ether/H₃O⁺
- This describes the Grignard reaction. CH₃CH₂CH₂Br reacted with Mg in dry ether forms a Grignard reagent. Reacting with CO₂ and further hydrolyzation with acid typically leads to the formation of propionic acid.

Considering the explanations above, the reaction described in option 1 does not directly form propionic acid. Thus, the answer is:

CH₃CH₂CH₃ + KMnO₄(Heat), OH^-/H₃O⁺

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