Advertisements
Advertisements
Question
Why is sulphuric acid not used during the reaction of alcohols with KI?
Advertisements
Solution
\[\ce{2KI + 2H2SO4 -> 2KHSO4 + 2HI}\]
\[\ce{2HI + H2SO4 -> 2H2O + I2 + SO2}\]
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
RELATED QUESTIONS
Draw the structure of the major monohalo product in the following reaction:
\[\ce{CH3CH2Br + NaI ->}\]
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.
Write the equation for the preparation of 1-iodobutane from 1-chlorobutane.
How will you bring about the following conversion?
Propene to 1-nitropropane
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:
\[\ce{CH3CH = C(CH3)2 + HBr ->}\]
How the following conversion can be carried out?
Propene to propan-1-ol
How the following conversion can be carried out?
Benzyl alcohol to 2-phenylethanoic acid
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?
But-1-ene to n-butyliodide
Among the isomeric alkanes of molecular formula C5H12, identify the one that on photochemical chlorination yields four isomeric monochlorides.
3-Methyl-pent-2-ene of peroxide forms an addition product. The number of possible stereoisomers for the product is ______.
The reagent used in the conversion of 1-butanol to 1-bromobutane is ______.
Predict the major product ‘P’ in the following sequence of reactions:
