Write the reagents to carry out following conversions:

I :

L i A l H_{4}

II :

P d / B a S O_{4}

(Rosenmund)

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I :

L i A l H_{4}

II :

H_{2} / R h C a t a l y s t

(Wilkinson's)

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I :

N a B H_{4}

II :

P d / B a S O_{4}

(Rosenmund)

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None of these

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Solution

The correct option is A I : $L i A l H_{4}$ II : $P d / B a S O_{4}$ (Rosenmund)
$L i A l H_{4}$ reduces acid chloride into alcohol.

$C H_{3} C O C l L i A l H_{4} \to C H_{3} C H_{2} O H$

Acid chlorides are reduced into aldehyde by $P d / B a S O_{4}$ poisoned by sulphur to avoid further reduction of carbonyl compound into alcohol. This reaction is called Rosenmund's reduction.

$C H_{3} C O C l P d / B a S O_{4} \to C H_{3} C H O + H C l$

Hence, the correct option is $A$

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List - I List - II

A) Lindlar catalyst i) Hydrogenation of oils

B) Fenton’s reagent ii) $P d + B a S O_{4}$

C) Zigler Natta catalyst iii) $F e S O_{4} + H_{2} O_{2}$

D) Raney Nickel iv) $R_{3} A l + T i C l_{4}$

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