NEET UG CHEMISTRY MCQ: ALCOHOLS & PHENOLS & ETHERS

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Purity of ether before using it as anaesthetic agent is tested by:

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Correct option: A

\mathrm{KI} +

starch

Option A (

\mathrm{KI} +

starch ) is correct because the presence of peroxides in ether, which can form upon exposure to air, is detected by reaction with KI, liberating iodine which turns starch blue.

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Ethers are made free from peroxide linkage on distilling impure sample with: The product 'B' in the following reaction is

{\text{C}}{{\text{H}}_3}{\text{C}}{{\text{H}}_2}{\text{OH}}\xrightarrow{{{\text{PCC}}}}{\text{A}}\xrightarrow[{\left( {{\text{ii}}} \right){\text{ }}{{\text{H}}_2}{\text{O/}}{{\text{H}}^ + }}]{{\left( {\text{i}} \right){\text{ HCN}}}}{\text{B}}

Fenton’s reagent is: Assertion:- Isopropyl benzene reacts with

\mathrm{O}_2

and acid gives phenol.

Reason:- Initially isopropyl benzene converts into 2-phenyl propan-2-ol. When an ether is treated with

{\mathrm{P}_2}{\mathrm{S}_5}

we get: Physical properties of: