#iodoform test

Preparation of Phenols and Ethers - Williamson and Other Methods

Which alcohol, on oxidation with PCC, yields a compound that does not react with I₂ and NaOH?

Propan-1-ol (CH₃CH₂CH₂OH) oxidizes to propanal (CH₃CH₂CHO) with PCC, which lacks the CH₃CO- group and does not give an iodoform reaction.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Phenols and Ethers - Williamson and Other Methods

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Preparation of Phenols and Ethers - Williamson and Other Methods

Which alcohol produces a compound with a CH₃CO- group on oxidation that reacts with I₂ and NaOH?

Pentan-2-ol (CH₃CH(OH)CH₂CH₂CH₃) oxidizes to pentan-2-one (CH₃COCH₂CH₂CH₃), which has a CH₃CO- group and gives a positive iodoform test.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Phenols and Ethers - Williamson and Other Methods

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Preparation of Alcohols - from Alkenes Haloalkanes Carbonyls Grignard

Which alcohol forms a yellow precipitate with I₂ and NaOH only after oxidation?

Ethanol (CH₃CH₂OH) oxidizes to acetaldehyde, which has a CH₃CO- group and gives a yellow iodoform precipitate with I₂ and NaOH.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Alcohols - from Alkenes Haloalkanes Carbonyls Grignard

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Classification and Nomenclature and Structures of Alcohols Phenols Ethers

Which of the following alcohols gives a negative iodoform test?

Butan-1-ol (CH₃CH₂CH₂CH₂OH) oxidizes to butanal, which lacks the CH₃CO- or CH₃CH(OH)- structure, giving a negative iodoform test.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers

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Classification and Nomenclature and Structures of Alcohols Phenols Ethers

Which of the following alcohols does not give a positive iodoform test?

The iodoform test is positive for CH₃CH(OH)- structures. Propan-1-ol (CH₃CH₂CH₂OH) oxidizes to propanal, which lacks the required group, giving a negative result.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers

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Classification and Nomenclature and Structures of Alcohols Phenols Ethers

Which alcohol gives a positive iodoform test?

The iodoform test is positive for alcohols with a CH₃CH(OH)- group. Propan-2-ol (CH₃CH(OH)CH₃) oxidizes to acetone, which gives a positive result.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers

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Classification and Nomenclature and Structures of Alcohols Phenols Ethers

Which compound is formed when ethanol reacts with I₂ and NaOH?

Ethanol (CH₃CH₂OH) oxidizes to acetaldehyde, which reacts with I₂ and NaOH in the iodoform test to form iodoform (CHI₃), a yellow precipitate.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers

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