What gas is evolved when CH₃CH₂OH reacts with SOCl₂ in the presence of pyridine to form CH₃CH₂Cl ?
SOCl₂ with pyridine converts ethanol to ethyl chloride, releasing SO₂ and HCl gases; SO₂ is the key gaseous byproduct.
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Nature of C-X Bond and Methods of Preparation