Question

which pictured aldehyde is more likely to undergo a competing reaction rather than the cannizzaro reaction

Answer 1

Aldehydes are more reactive than ketones due to less steric hindrance and absence of alkyl group stabilization. A sterically hindered or electron-deficient aldehyde is more likely to undergo competing reactions rather than the Cannizzaro reaction.

Step-by-step explanation:

The question pertains to aldehyde reactivity and competing reactions with reference to the Cannizzaro reaction. Given that the alkyl group in a ketone can partially neutralize the positive charge on the carbonyl carbon through hyperconjugation, an aldehyde which lacks comparable stabilization from alkyl groups is more reactive as an electrophile. This increased electrophilicity makes aldehydes more prone to nucleophilic attacks, and hence, underscores their tendency to undergo reactions like the Cannizzaro reaction, in which an aldehyde is converted into a mixture of alcohol and carboxylic acid without the presence of additional reductants.

However, if an aldehyde is sterically hindered or if it has a nearby electron-withdrawing group, it may resist undergoing the Cannizzaro reaction and instead favor other types of reactions. Examples of competing reactions include but are not limited to oxidation reactions, such as the Tollens' reaction used in silvering mirrors, the aldol reaction, which involves the formation of a β-hydroxy aldehyde or ketone, and reduction reactions where aldehydes are reduced to alcohols.

Answer 2

Picture 2 of aldehyde is more likely to undergo a competing reaction rather than the cannizzaro reaction

The answer is option ⇒2.Picture 2

Step-by-step explanation:

To determine which pictured aldehyde is more likely to undergo a competing reaction rather than the Cannizzaro reaction, we need to consider the specific characteristics of the aldehydes and the conditions required for the Cannizzaro reaction.

The Cannizzaro reaction is a disproportionation reaction that occurs in aldehydes with no α-hydrogen atoms. It involves the simultaneous oxidation of one molecule of aldehyde to a carboxylic acid and the reduction of another molecule of aldehyde to an alcohol.

Competing reactions can include aldol condensation, nucleophilic addition, or other reactions specific to the functional groups present in the aldehydes.

Without knowing the specific pictures or aldehydes mentioned, it is difficult to provide a direct answer. However, here are some general factors to consider when determining the likelihood of a competing reaction:

1. Presence of α-hydrogen atoms:

Aldehydes with α-hydrogen atoms are more likely to undergo competing reactions because these atoms can participate in various reactions such as aldol condensation.

2. Presence of other functional groups:

Aldehydes with additional functional groups, such as ketones, alcohols, or amines, may also be more likely to undergo competing reactions specific to those functional groups.

3. Steric hindrance:

Aldehydes with bulky substituents around the carbonyl group may experience steric hindrance, which can affect the reactivity and likelihood of competing reactions.

The answer is option ⇒2

Your question is incomplete, but most probably the full question was:

Which pictured aldehyde is more likely to undergo a competing reaction rather than the cannizzaro reaction? Refer to image below

1. Picture 1
2. Picture 2
3. Picture 3
4. Picture 4