
1) Aldehyde 2) Propenal
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https://www.crosswordclues.com/clue/acrolein

Acrolein (systematic name: propenal) is the simplest unsaturated aldehyde. It is a colourless liquid with a piercing, disagreeable, acrid smell. The smell of burnt fat (as when cooking oil is heated to its smoke point) is caused by glycerol in the burning fat breaking down into acrolein. It is produced industrially from propylene and mainly used a...
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http://en.wikipedia.org/wiki/Acrolein

• (n.) A limpid, colorless, highly volatile liquid, obtained by the dehydration of glycerin, or the destructive distillation of neutral fats containing glycerin. Its vapors are intensely irritating.
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http://thinkexist.com/dictionary/meaning/acrolein/

(from the article `fat`) ...250° C (392° and 482° F) without undergoing significant changes provided contact with air or oxygen is avoided. Above 300° C (572° F) fats may ...
Found on
http://www.britannica.com/eb/a-z/a/13

prop-2-enal
Found on
http://www.chemicalglossary.net/definition/121-Acrolein

(ak-ro´le-in) a volatile, highly toxic liquid, produced industrially and also one of the degradation products of cyclophosphamide.
Found on
http://www.encyclo.co.uk/local/21001
A·cro'le·in noun [ Latin
acer sharp +
olēre to smell.]
(Chemistry) A limpid, colorless, highly volatile liquid, obtained by the dehydration of glycerin, or the destructive distillation of neutral fats containing glycerin. Its vapors are intensely irritating.
Watts. Found on
http://www.encyclo.co.uk/webster/A/22

See under Bitter clay. Bitterton A wine defect caused by the aldehyde of acrylic acid called acrolein (also known as acrylaldehyde, aqualine, propenal). The substance is formed as a by-product of decomposition processes of glycerol triggered by... Full text
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https://glossary.wein.plus/acrolein

a yellow, flammable liquid, CHO, having a stifling odor, usually obtained by the decomposition of glycerol: used chiefly in the synthesis of commercial and pharmaceutical products. Also called
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https://www.infoplease.com/dictionary/acrolein
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