Acetaldehyde and acetone are both organic compounds that contain a carbonyl group. Acetaldehyde has a structure of CH3CHO, while acetone has a structure of (CH3)2CO. Acetaldehyde is a primary aldehyde, while acetone is a ketone. Acetaldehyde has a pungent odor and is commonly found in alcoholic beverages, while acetone is a colorless liquid with a sweet smell and is commonly used as a solvent. **

The reaction between acetaldehyde and formaldehyde is a condensation reaction, resulting in the formation of a compound called pentaerythritol. In this reaction, the aldehyde groups of acetaldehyde and formaldehyde react with each other, leading to the formation of a carbon-carbon bond and the elimination of water. This reaction is commonly used in organic synthesis to produce pentaerythritol, which has applications in the production of explosives, paints, and plastics. **

When acetaldehyde reacts with hydrogen cyanide, it forms a compound called hydroxyethyl cyanide. This reaction is a type of nucleophilic addition, where the hydrogen cyanide adds to the carbonyl group of acetaldehyde, forming a cyanohydrin. The resulting hydroxyethyl cyanide is an important intermediate in the synthesis of various organic compounds, including pharmaceuticals and agrochemicals. **

The oxidation number of carbon in acetaldehyde is +1, while in acetone it is +2. In acetaldehyde, the carbon atom is bonded to two hydrogen atoms and one oxygen atom, resulting in an overall oxidation number of +1. In acetone, the carbon atom is bonded to two other carbon atoms and one oxygen atom, leading to an oxidation number of +2. **

The boiling point of acetaldehyde is 20.2°C, while the boiling point of acetone is 56.05°C. Acetaldehyde has a lower boiling point compared to acetone due to differences in their molecular structures. Acetone has stronger intermolecular forces, such as dipole-dipole interactions and London dispersion forces, which require more energy to overcome, resulting in a higher boiling point. **

The molar mass of ethanol is 46.07 g/mol and the molar mass of acetaldehyde is 44.05 g/mol. Using the stoichiometry of the reaction, we can calculate that 1 mole of ethanol produces 1 mole of acetaldehyde. Therefore, 5g of ethanol is equivalent to 0.1085 moles. This would produce 0.1085 moles of acetaldehyde, which is equivalent to 4.77g. Therefore, 5g of ethanol would produce approximately 4.77g of acetaldehyde. **

The caricature of the summit conference in Helsinki shows the leaders of the United States and Russia, Donald Trump and Vladimir Putin, sitting at a table with Trump holding a puppet string attached to Putin. This caricature is a satirical representation of the perception that Trump is under the control or influence of Putin, suggesting that Putin is pulling the strings and manipulating Trump. The image reflects the controversy and speculation surrounding the relationship between the two leaders and the potential influence of Russia on the United States. **

A symposium is a formal gathering or meeting where experts in a particular field come together to discuss and exchange ideas on a specific topic. It is often organized as a series of presentations, panel discussions, and Q&A sessions, allowing participants to share their knowledge and insights with each other. Symposia are commonly held in academic and professional settings, providing a platform for networking, collaboration, and learning within a specific discipline or industry. **