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प्रश्न
Why is sulphuric acid not used during the reaction of alcohols with KI?
उत्तर
\[\ce{2KI + H2SO4 -> 2KHSO4 + 2HI}\]
\[\ce{2HI + H2SO4 -> 2H2O + I2 + SO2}\]
In these reactions, H2SO4 is an oxidising agent. It oxidises the HI formed during the reaction to I2 and prevents the formation of alkyl halide by the reaction of HI and alcohol. To overcome this problem, phosphoric acid (H3PO4) is used instead of H2SO4, which provides HI for the reaction and does not give I2 like H2SO4.
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संबंधित प्रश्न
Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields a single monochloride.
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\[\ce{CH3CH2Br + NaI ->}\]
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Write the equation for the preparation of 1-iodobutane from 1-chlorobutane.
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How will you bring about the following conversion?
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How will you bring about the following conversion?
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How will you bring about the following conversion?
Ethanol to ethyl fluoride
Write the structure of the major organic product in the following reaction:
\[\ce{CH3CH2CH2Cl + NaI ->[acetone][heat]}\]
Write the structure of the major organic product in the following reaction:
\[\ce{CH3CH = C(CH3)2 + HBr ->}\]
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