`underset(एथेनॉल)(CH_(3)CH_(2)OH)underset(-SO_(2),-HCl)overset(SOCl_(2),पिरिडीन) to underset(क्लोरोएथेन(A))(CH_(3)CH_(2)-Cl)underset(एसिटिलीन)(HC-=CH)+NaNH_(2)overset(द्रव NH_(3),196 K) to underset(सोडियम एसिटिलाइड(B))(HC-=C^(-)Na^(+))+NH_(3)`
`A+B to underset(ब्यूट--आईंन)(CH_(3)CH_(2)-C)-=+NaCl`
