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The reduction of an aldehyde

You get exactly the same organic product whether you use lithium tetrahydridoaluminate or sodium tetrahydridoborate.

For example, with ethanal you get ethanol:

Reduction of Aldehyde

Notice that this is a simplified equation - perfectly acceptable to UK A level examiners. [H] means "hydrogen from a reducing agent".

In general terms, reduction of an aldehyde leads to a primary alcohol.

The reduction of a ketone

Again the product is the same whichever of the two reducing agents you use.

For example, with propanone you get propan-2-ol:

reduction of a ketone

Reduction of a ketone leads to a secondary alcohol.

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