R-CllO-HR-NH2R-CH=N-R. This reaction gives best yield at:

(a) pH 1 - 2

(b) pH 4 - 5

(c) pH 10 - 11

(d) pH 13 - 14

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 62%
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An aromatic compound A of the molecular formula C8H10O on reaction with iodine and dilute NaOH gives a yellow precipitate. The structure of the compound is expected to be-

1. 

2. C6H5CHOHCH3

3. 

4.  

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 80%
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NEET 2023 - Target Batch - Aryan Raj Singh

In the following sequence :

CH3CH2ClNaCN(i)Ni/H2(ii)acetic anhydride(iii), product (iii) is

(1) CH3CH2CH2NH2

(2) CH3CH2CH2CONHCH3

(3) CH3CH2CH2NHCOCH3

(4) CH3CH2CH2CONHCOCH3

Subtopic:  Acid Derivatives - Preparation, Properties & Uses |
 71%
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Carbonyl compounds can generally be converted to hydrocarbons by :

1. H2/Pt

2. LiAlH4

3. N2H4-KOH/

4. K2Cr2O7-H2SO4

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 69%
From NCERT
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Which statement about the aldol condensation is correct ?

(1) A Lewis acid is commonly used as a catalyst

(2) The initial step is probably the formation of a carbanion

(3) A Lewis base is employed to induce carbocation formation 

(4) The carbon chain is lengthened through the elimination of 1 mole of water

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 59%
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A compound gives a positive test with I2/NaOH and is extracted from benzene by saturated NaHSO3, It may be :

1. CH3CH24CHO

2. CH3CH23COCH3

3. CH3CH2COCH2CH3

4. CH3CH24CH2OH

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 82%
From NCERT
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Reactant (A) and (B) is:

(1) Ph-CH2-CH=O + NH2-OH

(2) Ph-CH=O + NH2-OH

(3) Ph-CllO-CH3 + NH2-NH2

(4) Ph-CllO-CH3 + NH2-OH

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 65%
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CH3-CllO-OHCaOH2(A)

Product (A) is :

 

Subtopic:  Carboxylic Acids: Preparation & Properties |
 61%
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In which of the following compounds the methylenic hydrogens are the most acidic ?

(1) CH3COCH2CH3

(2) CH3CH2COOC2H5

(3) CH3CH2CHCOOC2H52

(4) CH3COCH2CN

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 56%
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The presence of unsaturation in organic compounds can be tested with :

(1) Schiff's reagent

(2) Tollen's reagent

(3) Fehling's reagent

(4) Baeyer's reagent

Subtopic:  Aldehydes & Ketones: Preparation & Properties |
 63%
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