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Uses of Hydrogen

Acetaldehyde ...

Question

Acetaldehyde can be converted to C by the following steps :

(i) Acidic

K M n O_{4}

(ii)

C a (O H)_{2}

and heat

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(i) Aqueous

K M n O_{4}

(ii)

B a (O H)_{2}

and heat

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(i) Acidic

K M n O_{4}

(ii)

N a O H

and heat

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(i) Aqueous

K M n O_{4}

(ii)

N a O H

and heat

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Solution

The correct option is A (i) Acidic $K M n O_{4}$ (ii) $C a (O H)_{2}$ and heat
DU in $A = \frac{(2 n_{C} + 2) - n_{H}}{2} = \frac{(2 \times 4 + 2) - 8}{2} = 1^{\circ}$
(Due to (--COOH) group)
Compound (B) is unstable and loses $C O_{2}$ , it shows (B) must contain $β$ keto acid, which accounts for three oxygen atoms in (A) and (B).
(A) must contain $β$ -hydroxy acid which on oxidation with PCC gives (B) ( $β$ -keto acid).

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