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Aldehyde ketones & carboxylic Acid MCQs for NEET — Chemistry Questions with Answers

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Which compound will form Schiff base with carbonyl compounds?

p-amines

sec-amines

bydroxylamine

Hydrazine

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Explanation

${C_{|}^{|}}_{R}^{R} = O + N H_{2} - R' \to {C_{|}^{|}}_{R}^{R} = N - R'$

N-alkyl or aryl imine is known as Schiff's base.

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Gem di-ether is obtained by:

(i) aldehyde, alcohol, $\overset{\oplus}{H}$

(ii) ketone, alcohol, $\overset{\oplus}{H}$

(iii) ketone, alcohol, O $\overset{\oplus}{H}$

(iv) aldehyde, alcohol, O $\overset{\oplus}{H}$

Select the correct answer from the codes given below:

Codes:

(i), (ii), (iii) and (iv)

(i), (ii) and (iv)

(iii) and (iv)

(i) and (ii)

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Explanation

Gem diether is acetal or ketal.

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Which among the following compounds will give addition reaction with water?

(i) $C H_{3} - C H = C H_{2}$

(ii) $C H_{3} - C \equiv C H$

(iii) $C C l_{3} - C H O$

(iv) $C H_{3} - C H O$

Select the correct answer from the codes given below:

Codes:

(i), (ii), (iii)

(i) and (ii)

(i), (ii), (iv)

only (iii)

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Explanation

Aduct of acetaldehyde is unstable.

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In the given reaction,

$C H_{3} - C \equiv N \overset{H_{2} O / ∆}{\to} (A) \overset{H_{2} O / \overset{\oplus}{H / ∆}}{\to} (B)$

(A) and (B) respectively are:

$O ∥ C H_{3} - C - N H_{2} a n d C H_{3} C O O H$

$C H_{3} C O O N H_{4} a n d C H_{3} C O O H$

$C H_{3} C O N H_{2} a n d C H_{3} C O O N H_{4}$

$C H_{3} - C H = N H a n d C H_{3} C O O H$

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Which among the following reagents can be used for the test of carbonyl group in laboratory?

$N H_{2} O H$

$N H_{2} N H_{2}$

$N a S O_{3} H$

$2, 4 - D N P H$

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In the reaction sequence,

$C_{6} H_{5} - C - C H_{3} \overset{N H_{2} O H / \overset{\oplus}{H}}{\to} (A) \overset{P_{2} O_{5}}{\to} [X] ∥ O$

[X] will be:

$C_{6} H_{5} - C - C H_{3} ∥ N - O H$

$C H_{3} C O O H$

$C_{6} H_{5} - N H_{2}$

$C H_{3} - C O - N H - C_{6} H_{5}$

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Consider the following statements for carbonyl compounds:

(i) They give nucleophilic addition reaction.

(ii) Aldehyde is more reactive than ketone for nucleophilic addition reaction.

(iii) $β -$ hydrogen of carbonyl compound is more acidic than $α -$ hydrogen.

(iv) They give addition reaction followed by elimination reaction with $N H_{2} - N H - C_{6} H_{4} - C H_{3}$ .

Of these statements:

(i) and (ii) are correct

(i), (ii) and (iv) are correct

(i), (ii) and (iii) are correct

(i), (ii), (iii) and (iv) are correct

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Explanation

$α - h y d r o g e n i s m o r e a c i d i c t h a n β - h y d r o g e n$

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Consider the following statements for a carbonyl compound:

(i) It gives addition reaction

(ii) It gives condensation reaction

(iii) It gives elimination reaction

(iv) It gives oxidation reaction

Of these statements:

(i), (ii), (iii) and (iv) are correct

(i) and (ii) are correct

(i), (ii) and (iii) are correct

(i), (ii) and (iv) are correct

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Explanation

its not an elimination reaction alone, its an addition reaction followed by elimination.

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Vapour density of an organic compound is 23.0. It contains 52.17% of carbon and 13% of hydrogen. The compound gives iodoform test. The compound is:

ethanol

dimethyl ether

acetone

methanal

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Explanation

(a) Molar mass of compound is 46 which is of ethanol. It also gives iodoform test.

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An organic compound X on treatment with acidified K₂Cr₂O, gives compound Y which reacts with I₂, and NaOH to form CHI₃. The compound X can be

CH₃OH

CH₃CHO

CH₃COCH₃

CH₃CH(OH)CH₃

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Explanation

its 2 degree alcohol, which on oxidation gives ketone, and since product will be propanone , so it will give +ve iodoform reaction.

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