Advertisements
Advertisements
प्रश्न
Why is sulphuric acid not used during the reaction of alcohols with KI?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. Identify the hydrocarbon.
Write the equation for the preparation of 1-iodobutane from 1-butanol.
How will you bring about the following conversion?
Propene to 1-nitropropane
How will you bring about the following conversion?
Propene to propyne
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:
\[\ce{CH3CH2CH = CH2 + HBr->[peroxide]}\]
Write the structure of the major organic product in the following reaction:
\[\ce{CH3CH = C(CH3)2 + HBr ->}\]
Primary alkyl halide C4H9Br (a) reacted with alcoholic KOH to give compound (b). Compound (b) is reacted with HBr to give (c) which is an isomer of (a). When (a) is reacted with sodium metal it gives compound (d), C8H18 which is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of (a) and write the equations for all the reactions.
How the following conversion can be carried out?
2-Methyl-1-propene to 2-chloro-2-methylpropane
How the following conversion can be carried out?
tert-Butyl bromide to isobutyl bromide
Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields three isomeric monochlorides.
Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields four isomeric monochlorides.
Which is the incorrect option?
X and Y will be?
Alkyl halides are prepared from alcohols by treating with ______.
Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?
How many products (including stereoisomers) are expected from the monochlorination of the following compound?
\[\begin{array}{cc}
\ce{H3C}\phantom{..................................}\\
\backslash\phantom{...........................}\\
\ce{CH - CH2 - CH3}\\
/\phantom{...........................}\\
\ce{H3C}\phantom{...................................}
\end{array}\]
