(i) 2 CH3CHO --dil.NaOH-- x --heat(delta),-H2O-- y : Write chemical formula and IUPAC name of x and y in the above chemical sequence. (ii) Write short note on Gattermann - Koch reaction.

**OR**

(i) CH3MgBr + CO2 --dry ether-- x --+H3O+-- y : Write chemical formula and name

Question

(i) 2 CH3CHO --dil.NaOH--> x --heat(delta),-H2O--> y : Write chemical formula and IUPAC name of x and y in the above chemical sequence. (ii) Write short note on Gattermann - Koch reaction.

**OR**

(i) CH3MgBr + CO2 --dry ether--> x --+H3O+--> y : Write chemical formula and name of x and y in the above chemical sequence. (ii) Write short note on Rosenmund reduction.

Accepted Answer

>

> [!TLDR]
> The sequence is a classic base-catalysed aldol addition followed by dehydration (aldol condensation), converting two molecules of acetaldehyde into an unsaturated aldehyde.
>
> (i) 2 CH3CHO --dil. NaOH--> x --heat(Delta), -H2O--> y
>
> Step 1 (Aldol addition): Dilute NaOH generates a carbanion (enolate) from one molecule of acetaldehyde (by removing an alpha-H), which then attacks the carbonyl carbon of a second acetaldehyde molecule as a nucleophile:
> 2 CH3CHO --dil. NaOH--> CH3-CH(OH)-CH2-CHO
> x = 3-hydroxybutanal (common name: acetaldol / aldol) - a beta-hydroxy aldehyde.
> …

🔒Unlock the full solution

🔒Unlock the full solution

Unlock the full solution

Unlock the full solution