Chemical Reactions

Two molecules of acetaldehyde gives aldol on aldol condensation. 

Phenol on reaction with chloroform and gives salicylaldehyde, which with KOH solution undergoes Cannizaro' s reaction.

In vicinal-dihalides, the two atoms are present at adjacent positions. In case of only one such structure is possible. Hence, only one vicinal-dihalide is possible for


1, 2-dichloropropane

The reaction is which 2 molecules of chlorobenzene reacts with metallic sodium in presence of dry ether forming diphenyl is an example of Wurtz-Fittig reaction. For reaction can be written as:

Ozonolysis of propene results in the formation of two carbonyl compounds. These compounds are typically either aldehydes or ketones. Upon ozonolysis, if the compound shows a magnetic moment ( ), it indicates the presence of unpaired electrons in the molecule, which is characteristic of a paramagnetic substance. The magnetic moment is related to the number of unpaired electrons by the formula: where is the number of unpaired electrons. A magnetic moment of suggests that the molecule has one unpaired electron, confirming its paramagnetic nature.

The Swarts reaction is a nucleophilic substitution reaction where an alkyl halide reacts with a metal halide, such as silver chloride, to form a new alkyl halide. The Witting reaction is a nucleophilic addition reaction, where a phosphorus ylide reacts with a carbonyl compound to form an alkene.

The Etard reaction is an important organic reaction that selectively oxidizes aromatic methyl groups ( ) into aldehydes ( ) using a specific oxidizing agent.
Step 1: Key Reagent in the Etard Reaction.
The key reagent used in the Etard reaction is chromyl chloride ( ). This compound is a strong oxidizing agent that is used to convert methyl groups on aromatic compounds, such as toluene, into formyl groups ( ) to form benzaldehyde.
Step 2: Example Reaction.
For instance, when toluene ( ) reacts with chromyl chloride in a solvent like carbon tetrachloride ( ), the methyl group of toluene is oxidized to form benzaldehyde ( ): This is a typical example of how the Etard reaction works.
Conclusion:
The correct reagent used in the Etard reaction is chromyl chloride .

When zinc reacts with dilute hydrochloric acid, the reaction is: Hydrogen gas ( ) is released during this reaction. Answer: The gas produced is hydrogen, so the correct answer is option (2).