Alcohols, Phenols and Ethers
Bihar Board · Class 12 · Chemistry
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What is the IUPAC name of the compound CH₃CH₂CH₂OH?
The common name of C₆H₅OH is:
Which reagent is used for the hydroboration-oxidation of alkenes to prepare alcohols?
The boiling point of alcohols is higher than corresponding alkanes due to:
Sample Questions
Which of the following compounds are classified as secondary alcohols?
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CH₃CH(OH)CH₃, CH₃CH(OH)CH₂CH₃
Secondary alcohols have the OH group attached to a carbon atom that is bonded to two other carbon atoms. CH₃CH(OH)CH₃ (propan-2-ol) and CH₃CH(OH)CH₂CH₃ (butan-2-ol) are both secondary alcohols. The others are primary or tertiary alcohols.
Which of the following reactions can be used to prepare phenols?
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Hydrolysis of diazonium salts, Fusion of chlorobenzene with NaOH, Cumene process
Phenols can be prepared by: (1) hydrolysis of diazonium salts with water, (2) fusion of haloarenes like chlorobenzene with NaOH at high temperature and pressure, and (3) the cumene process involving oxidation of cumene. The other options are methods for preparing alcohols, not phenols.
The order of acidity among the following compounds is:
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Phenol > Water > Alcohol
Phenol is more acidic than water and alcohol because the phenoxide ion formed after losing H⁺ is stabilized by resonance with the benzene ring. Water is more acidic than alcohol because alkyl groups are electron-donating and destabilize the alkoxide ion formed.
What is the main product when ethanol is heated with concentrated H₂SO₄ at 443 K?
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Ethene
When ethanol is heated with concentrated H₂SO₄ at 443 K (170°C), dehydration occurs to form ethene (CH₂=CH₂) and water. At lower temperatures (413 K), diethyl ether would be formed instead. The high temperature favors elimination over substitution.
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