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(A) Primary alcohols can be easily oxidi...

(A) Primary alcohols can be easily oxidised to aldehydes.
(R) Aldehydes are prone to further oxidation to carboxylic acids.

A

If both (A) and (R) are correct and (R) is the corect explanation of (A)

B

If both (A) and (R) are correct but (R) is not correct explanation of (A)

C

If (A) is correct but (R) is incorrect.

D

If (A) is incorrect but (R) is correct

Text Solution

Verified by Experts

The correct Answer is:
D
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Explore conceptually related problems

Statement -I : Secondary alcohols can be easily oxidised to aldehydes. Statement -I:Aldehydes are prone to further oxidation to carboxylic acids.

Assertion : It is not so easy to oxidise primary alcohols to aldehydic stage. Reason : Aldehydes are prone to furthr oxidation to carbonxylic acids.

A : Primary alcohols on oxidation give aldehydes. R : Aldehydes can be oxidized into the corresponding carboxylic acids.

Primary alcohols on dehydrogenation give aldehydes.

From Primary Alcohols And Aldehydes

Aldehydes are less easily oxidised than ketones.

Primary and secondary alcohols are dehydrogenated by copper at 573 K to aldehydes and ketones respectively. In contrast tertiary alcohols are dehydrated to alkenes by heating with copper at 573 K. Similarly, primary alcohols are easily oxidised to form first an aldehyde and then a carboxylic acid while secondary alcohols are oxidised to ketones which are further oxidised to form a mixture of acids. Tertiary alcohols are oxidised with difficulty and with strong oxidising agents in acidic medium. They form first ketones and then acids. In the case of alcohols containing carbon-carbon double bond, some oxidising agents oxidise both double bond and OH group while other reagents donot affect C-Chond. The reagent which oxidises 1^(@) alcohol to aldehyde without affecting C=C double bond is

OP TANDON-ALDEHYDES AND KETONES -ASSERTION-REASON TYPE QUESTIONS
  1. (A) Carbonyl compounds take part in nucleophilic addition reactions. ...

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  2. (A) Primary alcohols can be easily oxidised to aldehydes. (R) Aldehy...

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  3. Assertion: The addition of ammonia derivative to a carbonyl compound i...

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  4. (A) Fehiling's reagent is a test for all aliphatic aldehydes. (R) Al...

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  5. (A) 2-Methlpropanal undergoes Cannizzaro's reaction. (R) It has no a...

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  6. Assertion (A) Formaldehyde is a planar molecule. Reason (R) It conta...

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  7. (A) Nitromethane can give aldol condensation. (R) alpha hydrogen of ...

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  8. Assertion : Chloral hydrate is a stable compound. Reason : It is sta...

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  9. (A) Acetaldehyde does not show aldol condensation. (R) Compounds ha...

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  10. (A) Lower aldehydes and ketones are soluble in water but solubility de...

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  11. Assertion : Dimethyl sulphide is commonly used for the reduction of a...

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  12. (A) alpha-hydrogen atom of carbonly compouns is acidic in nature. (R...

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  13. Assertion (A): The following intramolecular aldol reaction occurs. ...

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  14. (A) Acetaldehyde reduces Fehlintgs' solution but benzaldehyde does not...

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  15. (A) p-methoxy benzaldehyde is less recative than bensaldehyde towards ...

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  16. (A) Benzaldehyde gives a positive test with Benedict's and Fehiling so...

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