Question

Acetaldehyde can be prepared by

• A. $CH_3CH_2Br \xrightarrow[\Delta]{KCN(alc)} \,\, \xrightarrow[(ii) H_2O/\Delta]{(i) SnCl_2/HCl, {\text{ether}}}$
• B. $CH \equiv CH +H_2O \xrightarrow{H_2SO_4}$
• C. $CH_2 = CH_2 \xrightarrow[{\text{High Temperature, pressure}}]{CO, \,H_2,\, (Co(CO)_4)_2 }$
• D. $CH_3COOH \xrightarrow{CaCO_3}\,\, \xrightarrow{\Delta}$

Answer 1

Answer: (B)

$CH_3CH_2Br \xrightarrow[\Delta]{KCN(alc)} \underset{\text{Propane nitrile}}{CH_3CH_2CN }\xrightarrow[(ii)H_2O/\Delta]{(i) snCl_2/HCl,{\text{Ether}}}\underset{\text{Propanaldehyde}}{CH_3CH_2CHO }$
$CH \equiv CH +H_2O \xrightarrow{H_2SO_4} CH_3CHO$
$CH_2 = CH_2 +CO +H_2 \xrightarrow[{\text{High}}T,P]{(Co(CO)_4)_2} \underset{\text{Oxoprocess}}{CH_3CH_2CHO }$
$CH_3COOH \xrightarrow{CaCO_2}(CH_3COO)_2 Ca \xrightarrow[-CaCO_3]{\Delta}(CH_3)_2CO$