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The number of alcohols giving iodoform t...

The number of alcohols giving iodoform test among the following is:
`CH_(3) CH_(2) OH, CH_(3) OH, CH_(3) CH_(2) CH_(2) OH, (CH_(3))_(2) (CHOH), CH_(3) CH_(3) CH_(2) CH_(2) OH`
`CH_(3) CH_(2) CH (OH)CH_(3), CH_(3) CH (OH)CH (CH_(3))_(2) (C_(2) H_(5))_(2) CHOH, (CH_(3))_(3) COH`

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The correct Answer is:
To determine the number of alcohols that give the iodoform test from the provided list, we need to identify which of these alcohols can be oxidized to form a ketone. The iodoform test is positive for alcohols that can be oxidized to methyl ketones or for ethanol (which can form acetaldehyde). ### Step-by-Step Solution: 1. **Identify the Alcohols**: The given alcohols are: - CH₃CH₂OH (Ethanol) - CH₃OH (Methanol) - CH₃CH₂CH₂OH (Propan-1-ol) - (CH₃)₂CHOH (Isopropanol or 2-Propanol) - CH₃CH₃CH₂CH₂OH (Butan-1-ol) - CH₃CH₂CH(OH)CH₃ (Butan-2-ol) - CH₃CH(OH)CH(CH₃)₂ (2-Pentanol) - (CH₃)₃COH (Tert-butanol) 2. **Classify the Alcohols**: - Ethanol (CH₃CH₂OH) is a 1° alcohol but can give a positive iodoform test as it can be oxidized to acetaldehyde. - Methanol (CH₃OH) is a 1° alcohol and does not give a positive iodoform test. - Propan-1-ol (CH₃CH₂CH₂OH) is a 1° alcohol and does not give a positive iodoform test. - Isopropanol ((CH₃)₂CHOH) is a 2° alcohol and gives a positive iodoform test as it can be oxidized to acetone. - Butan-1-ol (CH₃CH₃CH₂CH₂OH) is a 1° alcohol and does not give a positive iodoform test. - Butan-2-ol (CH₃CH₂CH(OH)CH₃) is a 2° alcohol and gives a positive iodoform test as it can be oxidized to a methyl ketone. - 2-Pentanol (CH₃CH(OH)CH(CH₃)₂) is a 2° alcohol and gives a positive iodoform test as it can be oxidized to a methyl ketone. - Tert-butanol ((CH₃)₃COH) is a 3° alcohol and does not give a positive iodoform test. 3. **Count the Alcohols that Give Positive Iodoform Test**: - Ethanol (1) - Isopropanol (2) - Butan-2-ol (3) - 2-Pentanol (4) Thus, the total number of alcohols that give a positive iodoform test is **4**. ### Final Answer: The number of alcohols giving the iodoform test among the following is **4**.
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