Which will not respond positively with fehling solution?
$i . H_{2} C O, i i . C_{6} H_{5} C H O i i i . C H_{3} - C | O H H - O | | C - C H_{3}, i v . H - O | | C - N H_{2}$

(ii) and (iv)

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(ii) only

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(ii), (iii) and (iv)

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(i) and (ii)

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Solution

The correct option is C (ii), (iii) and (iv)
Aromatic aldehydes can not oxidised by Fehlings' solution. Acid derivatives like ester, anhydride and amide can not oxidised by this reagent. However, $α$ -hydroxy ketones (terminal) are oxidised by both Fehlings' solution and Tollens' reagent.

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Similar questions

Q. Arrange the following compounds in decreasing order of reactivity towards nucleophilic addition reaction.

C H_{3} - O | | C I - C H_{3}

C H_{3} - O | | C I I - C l

C H_{3} - O | | C I I I - N H_{2}

C H_{3} - O | | C I V - O H

C H_{3} - O | | C - O V - O | | C - C H_{3}

Q. Suppose the following reaction :

C H_{3} - C H_{3} | C H - O | | C - O H + C H_{3} - N H_{2} \to A - \to Δ B L i A l H_{4} (e x c e s s) - --- \to^{'} C^{'}

The final product 'C' will be:

Which of the following is not correct?

$O r d e r o f b a s i c i t y O r d e r o f n u c l e o p h i l i c i t y (a) F^{-} > C l^{-} > B r^{-} B r_{-} > C l^{-} > F^{-} (b) H - O - O^{-} > O H^{-} H - O - O^{-} > O H^{-} (c) C H_{3} > N H_{2}^{-} > O H - C H_{3} > N H_{2}^{-} > O H^{-} (d) H_{2} O > H_{2} S H_{2} O < H_{2} S$

Q. The order of stability of the following tautomeric compounds is:

C H_{2} = O H | C - C H_{2} - O | | C - C H_{3} ⇌ C H_{3} - O | | C - C H_{2} - O | | C - C H_{3} ⇌ C H_{3} - O H | C = C H - O | | C - C H_{3}

I

I I

I I I

C H_{2} = O H | C - C H_{2} (I) - O | | C - C H_{3} ⇌ C H_{3} - O | | C - C H_{2} (I I) - O | | C - C H_{3}

⇌ C H_{3} - O H | C = C H (I I I) - O | | C - C H_{3}

The order of stability of the following tautomeric compounds is:

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Which will not respond positively with fehling solution? i. H2CO, ii. C6H5CHOiii. CH3−C|OHH−O||C−CH3, iv. H−O||C−NH2

The correct option is C (ii), (iii) and (iv)Aromatic aldehydes can not oxidised by Fehlings' solution. Acid derivatives like ester, anhydride and amide can not oxidised by this reagent. However, α-hydroxy ketones (terminal) are oxidised by both Fehlings' solution and Tollens' reagent.

Which will not respond positively with fehling solution?
$i . H_{2} C O, i i . C_{6} H_{5} C H O i i i . C H_{3} - C | O H H - O | | C - C H_{3}, i v . H - O | | C - N H_{2}$

The correct option is C (ii), (iii) and (iv)
Aromatic aldehydes can not oxidised by Fehlings' solution. Acid derivatives like ester, anhydride and amide can not oxidised by this reagent. However, $α$ -hydroxy ketones (terminal) are oxidised by both Fehlings' solution and Tollens' reagent.