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Which of the following reagents cannot be used to distinguish between hexanal and 2-hexanone?
- a)Tollen's reagent
- b)Br₂ in CCl₄
- c)I₂ in NaOH
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the following reagents cannot be used to distinguish between ...
Reagents to distinguish between hexanal and 2-hexanone:
Tollens reagent:
- Tollens reagent is a solution of silver nitrate in ammonia.
- It is used to distinguish between aldehydes and ketones.
- When Tollens reagent is added to an aldehyde, it forms a silver mirror on the inner surface of the test tube.
- However, ketones do not give this reaction.
Br in CCl4:
- Bromine in carbon tetrachloride is used to distinguish between alkenes and alkanes.
- Alkenes will decolorize the bromine solution while alkanes will not react with it.
- This reagent cannot be used to distinguish between hexanal and 2-hexanone as both of these compounds do not contain a carbon-carbon double bond.
I in NaOH:
- Iodine in sodium hydroxide is used to distinguish between primary, secondary, and tertiary alcohols.
- Primary alcohols will give a yellow precipitate of iodine when reacted with this reagent.
- Secondary alcohols will give a cloudy solution, while tertiary alcohols will not react with it.
- This reagent cannot be used to distinguish between hexanal and 2-hexanone as both of these compounds are neither alcohols nor contain an -OH group.
Conclusion:
Therefore, the correct answer is option B, Br in CCl4, as it cannot be used to distinguish between hexanal and 2-hexanone.
Tollens reagent:
- Tollens reagent is a solution of silver nitrate in ammonia.
- It is used to distinguish between aldehydes and ketones.
- When Tollens reagent is added to an aldehyde, it forms a silver mirror on the inner surface of the test tube.
- However, ketones do not give this reaction.
Br in CCl4:
- Bromine in carbon tetrachloride is used to distinguish between alkenes and alkanes.
- Alkenes will decolorize the bromine solution while alkanes will not react with it.
- This reagent cannot be used to distinguish between hexanal and 2-hexanone as both of these compounds do not contain a carbon-carbon double bond.
I in NaOH:
- Iodine in sodium hydroxide is used to distinguish between primary, secondary, and tertiary alcohols.
- Primary alcohols will give a yellow precipitate of iodine when reacted with this reagent.
- Secondary alcohols will give a cloudy solution, while tertiary alcohols will not react with it.
- This reagent cannot be used to distinguish between hexanal and 2-hexanone as both of these compounds are neither alcohols nor contain an -OH group.
Conclusion:
Therefore, the correct answer is option B, Br in CCl4, as it cannot be used to distinguish between hexanal and 2-hexanone.
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Community Answer
Which of the following reagents cannot be used to distinguish between ...
Hexanal will give the positive reaction from Br2 in CCl4 whereas 2- hexanone will not give.And 2- hexanone will give positive test from I2 in NaOH but not hexanal.....So, answer may be b or c.
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Which of the following reagents cannot be used to distinguish between hexanal and 2-hexanone?a) Tollen's reagent b) Br₂ in CCl₄ c) I₂ in NaOH d) None of these Correct answer is option 'B'. Can you explain this answer?
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