Question
Reaction by which benzaldehyde cannot be prepared ?
A.
$$ + Cr{O_2}C{l_2}$$ and $$C{S_2}$$ followed by $${H_3}{O^ + }$$
$$ + Cr{O_2}C{l_2}$$ and $$C{S_2}$$ followed by $${H_3}{O^ + }$$ B.
$$ + {H_2}$$ in presence of $$Pd{\text{ - }}BaS{O_4}$$
$$ + {H_2}$$ in presence of $$Pd{\text{ - }}BaS{O_4}$$ C.
$$ + CO + HCl$$ in presence of $$anhy.$$ $$AlC{l_3}$$
$$ + CO + HCl$$ in presence of $$anhy.$$ $$AlC{l_3}$$ D.
$$ + Zn/Hg$$ and $$conc.\,HCl$$
$$ + Zn/Hg$$ and $$conc.\,HCl$$
Answer :
$$ + Zn/Hg$$ and $$conc.\,HCl$$
$$ + Zn/Hg$$ and $$conc.\,HCl$$ Solution :
This reaction is known as Etard reaction.
This reaction is called Rosenmund reaction.
The above reaction is known as Gattermann-Koch aldehyde synthesis.
Thus, from the reactants given in option (D) benzaldehyde is not obtained.
This reaction is known as Etard reaction.
This reaction is called Rosenmund reaction.
The above reaction is known as Gattermann-Koch aldehyde synthesis.
Thus, from the reactants given in option (D) benzaldehyde is not obtained.