Acetaldehyde - C2H4O

What is Acetaldehyde (C2H4O)?

C2H4O is an organic chemical compound with chemical name Acetaldehyde.

Acetaldehyde is also called as MeCHO. It is miscible with naptha, gasoline, xylene, ether, turpentine, alcohol and benzene. It has no colour and is a flammable liquid. It has a suffocating smell. It is non-corrosive to many metals but when It has a narcotic action and can cause mucous irritation.

Table of Contents

Acetaldehyde is widely used in the manufacturing of perfumes, drugs, acetic acid, flavouring agent, dyes, etc. When acetaldehyde is applied externally for prolonged periods it is toxic. Acetaldehyde was first observed in the year 1774 by the Swedish pharmacist/chemist Carl Wilhelm Scheele.

Acetaldehyde Structure (C2H4O Structure)

Acetaldehyde - C2H4O

Properties of Acetaldehyde – C2H4O

C2H4O Acetaldehyde
Molecular Weight/ Molar Mass 44.05 g/mol
Density 0.784 g/cm3
Boiling Point 20.2 °C
Melting Point -123.5 °C

Chemical Properties of Acetaldehyde – CH3CHO

1. Acetaldehyde reacts with Hydrazine

The nitrogen atom of phenyl hydrazine acts as a nucleophile which attacks at the electrophilic carbon of acetaldehyde and removes water to give acetaldehyde phenylhydrazone.

Acetaldehyde reacts with Hydrazine

2. Acetaldehyde reacts with HCN

Hydrogen cyanide adds across the carbon-oxygen double bond in aldehydes and ketones to produce compounds known as hydroxynitriles. For example, with ethanal (an aldehyde) you get 2-hydroxypropanenitrile.

Acetaldehyde reacts with HCN

3. Acetaldehyde reacts with NaoH

Acetaldehyde (A) reacts when NaOH undergoes aldol condensation forming beta-hydroxyacetaldehyde on heating gives alpha-beta-unsaturated aldehyde.

Acetaldehyde reacts with NaOH

Acetaldehyde (C2H4O) Uses

  • It was used as a precursor to acetic acid.
  • It is used as a precursor to pyridine derivatives, crotonaldehyde, and pentaerythritol.
  • Used in the manufacturing of resin.
  • It is used to produce polyvinyl acetate.
  • It is used in the manufacturing of disinfectants, perfumes, and drugs
  • It is used in the production of chemicals such as acetic acid.

Frequently Asked Questions

What is acetaldehyde?

Acetaldehyde is present in various plants, ripe fruits, vegetables, smoke from tobacco, gasoline and exhaust from the engine. This material is commonly used as a flavouring agent and as an intermediate in alcohol metabolism in the manufacture of acetic acid, perfumes, dyes, and medicines.

What are the health effects of acetaldehyde?

Acute (short-term) exposure to acetaldehyde results in effects which include eye, skin, and respiratory tract irritation. Symptoms of chronic (long-term) acetaldehyde poisoning mimic those of alcoholism.

How does acetaldehyde affect the liver?

A major toxic metabolite, acetaldehyde is one of the main culprits mediating fibrogenic and mutagenic effects of alcohol in the liver. Mechanistically, acetaldehyde promotes the formation of adducts, leading to functional impairments of key proteins, including enzymes, and DNA damage, which promotes mutagenesis.

What is the difference between formaldehyde and acetaldehyde?

The iodoform test will differentiate the formaldehyde and acetaldehyde. Methyl ketones react to yellow precipitate by giving iodine and potassium hydroxide. Acetaldehyde binds to the carboxylic acid with iodine and KOH to give sodium salt. Formaldehyde does not screen for iodoformity.

What are the uses of acetaldehyde?

In other applications, acetaldehyde serves as an additive such as fruit and fish preservatives, flavouring agents, gelatine hardening. Acetaldehyde is also used as a preservative for fruit and fish in the manufacture of vinegar, yeast and.

Learn more about the Structure, physical and chemical properties of Acetaldehyde from the experts at BYJU’S.

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