When glycerol is heated with KHSO4, it gives
(1) CH2=CH-CH
(2) CH2=CH-CH2OH
(3) CH2=CH-CHO
(4) CH2=C=CH,
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CH2OH - KHSO4 (-2H2O) -> CH2=C=CH-OH - Tautomerize -> CH2=CH-CH=O (Acrolein also called acraldehyde)
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