The best combination of reagents for carrying out the
conversion RCH₂CH₂OH → RCH₂CH₂COOH is
(a) PBr₃, KCN, H₃O⁺ (b) PBr₃, KCN, H₂/Pt
(c) KCN, H₃O⁺ (d) PBr₃, H₃O⁺
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Explanation:
I think the correct answer is (b)
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The best combination of reagents for carrying out the
conversion RCH₂CH₂OH → RCH₂CH₂COOH is
(a) PBr₃, KCN, H₃O⁺
When alcohols are made to react with PBr₃, it forms the respective bromide.
So, RCH₂CH₂OH + PBr₃ → RCH₂CH₂Br
When alcoholic KCN solution is made to react with alkyl bromide, it forms alkyl cyanide.
RCH₂CH₂Br + KCN → RCH₂CH₂CN
Next, the alkyl cyanide is hydrolysed to form carboxylic acid.
RCH₂CH₂CN + H₃O⁺ →RCH₂CH₂COOH (Required product)
So, option (a) is correct.
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