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Which of the following will not give iodoform test?
- a)Ethanol
- b)Ethanal
- c)Isopropyl alcohol
- d)Benzyl alcohol
Correct answer is option 'D'. Can you explain this answer?
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Which of the following will not give iodoform test?a)Ethanolb)Ethanalc...
Iodoform Test
The iodoform test is a qualitative test used to identify the presence of a methyl ketone, a secondary alcohol or a primary alcohol that can be oxidized to a methyl ketone.
The test is based on the reaction of iodine with the methyl ketone or alcohol in the presence of a strong base such as sodium hydroxide.
Iodoform test is positive if a yellow precipitate of iodoform is formed.
Options
a) Ethanol: Ethanol is a primary alcohol that can be oxidized to acetaldehyde which is a methyl ketone. Hence, ethanol gives a positive iodoform test.
b) Ethanal: Ethanal is a methyl ketone, and it gives a positive iodoform test.
c) Isopropyl alcohol: Isopropyl alcohol is a secondary alcohol that can be oxidized to acetone which is a methyl ketone. Hence, isopropyl alcohol gives a positive iodoform test.
d) Benzyl alcohol: Benzyl alcohol is a primary alcohol that cannot be oxidized to a methyl ketone. Hence, benzyl alcohol does not give a positive iodoform test.
Conclusion
The correct option is 'D' (Benzyl alcohol) as it does not give a positive iodoform test.
The iodoform test is a qualitative test used to identify the presence of a methyl ketone, a secondary alcohol or a primary alcohol that can be oxidized to a methyl ketone.
The test is based on the reaction of iodine with the methyl ketone or alcohol in the presence of a strong base such as sodium hydroxide.
Iodoform test is positive if a yellow precipitate of iodoform is formed.
Options
a) Ethanol: Ethanol is a primary alcohol that can be oxidized to acetaldehyde which is a methyl ketone. Hence, ethanol gives a positive iodoform test.
b) Ethanal: Ethanal is a methyl ketone, and it gives a positive iodoform test.
c) Isopropyl alcohol: Isopropyl alcohol is a secondary alcohol that can be oxidized to acetone which is a methyl ketone. Hence, isopropyl alcohol gives a positive iodoform test.
d) Benzyl alcohol: Benzyl alcohol is a primary alcohol that cannot be oxidized to a methyl ketone. Hence, benzyl alcohol does not give a positive iodoform test.
Conclusion
The correct option is 'D' (Benzyl alcohol) as it does not give a positive iodoform test.
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Community Answer
Which of the following will not give iodoform test?a)Ethanolb)Ethanalc...
Bro just check is CH3CHOH or CH3CO present so it will give iodoform test
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Which of the following will not give iodoform test?a)Ethanolb)Ethanalc)Isopropyl alcohold)Benzyl alcoholCorrect answer is option 'D'. Can you explain this answer?
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