NEET UG CHEMISTRY MCQ: ALCOHOLS & PHENOLS & ETHERS

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Among the following, the number of compounds which will not give positive iodoform reaction is

(i) 1- Phenylbutane-2-one

(ii) 2-Methylbutan-2-ol

(iii) 3-Methylbutan-2-ol

(iv) 1-Phenylethanol

(v) 3,3-Dimethylbutan-2-one

(vi) 1-Phenylpropan-2-ol

View answer and explanation

Correct option: A

The correct answer is 2. Compounds that do NOT give a positive iodoform test are those lacking a methyl ketone or a secondary alcohol that can be oxidized to a methyl ketone.

More Questions from ALCOHOLS & PHENOLS & ETHERS

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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: