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(D) Rosenmund reduction involves the catalytic hydrogenation of an acid chloride to an aldehyde using $H_2$ gas in the presence of $Pd/BaSO_4$. To pre

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$HCHO$

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(D) Rosenmund reduction involves the catalytic hydrogenation of an acid chloride to an aldehyde using $H_2$ gas in the presence of $Pd/BaSO_4$. To prepare formaldehyde $(HCHO)$,the required starting material would be formyl chloride $(HCOCl)$. However,formyl chloride is highly unstable at room temperature and spontaneously decomposes into carbon monoxide $(CO)$ and hydrogen chloride $(HCl)$. Therefore,$HCHO$ cannot be prepared by the Rosenmund reduction method.

Rosenmund reduction cannot be used for the preparation of

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Identify the name of the reaction: $C_6H_5CH_3 + CrO_2Cl_2 \xrightarrow{CS_2} C_6H_5CH(OCrOHCl_2)_2 \xrightarrow{H_3O^+} C_6H_5CHO$.

What is $Z$ in the following reaction sequence?
$C_6H_5NH_2$ $\xrightarrow[(i) NaNO_2 + HCl / 273 \ K]{(ii) H_3PO_2 + H_2O}$ $\xrightarrow[(iii) CO, HCl, \text{anhydrous } AlCl_3/CuCl]{} Z$

Enumerate different methods to prepare aldehyde compounds.

The main reactants involved in the Etard reaction are:

$CH_3-CH(OH)-CN$ is

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