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Reduction of Carbonyls Calculator

Aldehydes and ketones reduced to alcohols.

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Alcohol

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Overview

The reduction of carbonyls involves the addition of hydrogen across the carbon-oxygen double bond to produce alcohols. This fundamental organic transformation changes the hybridization of the carbonyl carbon from sp² to sp³, effectively decreasing the oxidation state of the carbon atom.

Symbols

Variables

Carbonyl = Carbonyl Compound, [H] = Hydrogen / [H], Alcohol = Alcohol

Carbonyl
Carbonyl Compound
mol
[H]
Hydrogen / [H]
mol
Alcohol
Alcohol
mol

Apply it well

When To Use

When to use: Use this equation when calculating the molar yields of primary or secondary alcohols from aldehydes and ketones. It assumes a stoichiometric addition of hydrogen where one mole of diatomic hydrogen (H₂) reduces one mole of carbonyl functional group.

Why it matters: This reaction is essential for the industrial production of solvents, plasticizers, and pharmaceutical intermediates. It allows chemists to convert readily available plant-derived carbonyls into versatile alcohols used in fuels and fine chemicals.

Avoid these traps

Common Mistakes

  • Using NaBH₄ for carboxylic acids (won't work).
  • Forgetting LiAlH₄ reacts with water.
  • Wrong alcohol type produced.

One free problem

Practice Problem

A chemical process utilizes 5.5 moles of an aldehyde to produce a primary alcohol. If the reaction proceeds with 100% efficiency, how many moles of alcohol are generated?

Carbonyl Compound5.5 mol
Hydrogen / [H]5.5 mol

Solve for: alcohol

Hint: In a balanced reduction reaction, the molar ratio between the carbonyl reactant and the alcohol product is 1:1.

The full worked solution stays in the interactive walkthrough.

References

Sources

  1. McMurry, J. E. (2016). Organic Chemistry. 9th ed. Cengage Learning.
  2. IUPAC Gold Book: 'aldehyde', 'alcohol', 'reduction'
  3. Wikipedia: Carbonyl reduction
  4. Wikipedia: Orbital hybridisation
  5. Clayden, J., Greeves, N., Warren, S., & Wothers, P. (2012). Organic Chemistry (2nd ed.). Oxford University Press.
  6. Atkins, P., & de Paula, J. (2018). Atkins' Physical Chemistry (11th ed.). Oxford University Press.
  7. Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry, 2nd ed.; Oxford University Press: Oxford, UK, 2012.
  8. AQA A-Level Chemistry — Organic Chemistry