Carbonyl (Aldehyde and Ketones) Carboxyl and Amino Groups in Organic Compounds NEET Questions

Organic Chemistry - Principles of Practical Chemistry

Carbonyl (Aldehyde and Ketones) Carboxyl and Amino Groups in Organic Compounds MCQ Questions


1.
Ester formation test (esterification) involves:
A.
Carboxylic acid + KMnO₄ → CO₂
B.
Carboxylic acid + HCl → no reaction
C.
Carboxylic acid + NaOH → salt + water
D.
Carboxylic acid + alcohol + conc. H₂SO₄ → fragrant ester
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ANSWER :
D. Carboxylic acid + alcohol + conc. H₂SO₄ → fragrant ester
2.
Tollens' reagent is:
A.
Ammoniacal silver nitrate solution [Ag(NH₃)₂]OH
B.
Alkaline copper sulphate
C.
Sodium nitroprusside
D.
Sodium bisulphite
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ANSWER :
A. Ammoniacal silver nitrate solution [Ag(NH₃)₂]OH
3.
In Cannizzaro reaction of HCHO with NaOH:
A.
Acetaldehyde is formed
B.
HCOONa and CH₃OH are formed (disproportionation)
C.
Only formic acid is formed
D.
Only methanol is formed
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ANSWER :
B. HCOONa and CH₃OH are formed (disproportionation)
4.
When sodium fusion extract is acidified with conc. HNO₃ and then BaCl₂ added, white ppt indicates:
A.
Halogen
B.
Sulphur (BaSO₄ formed since S²⁻ oxidised to SO₄²⁻)
C.
Nitrogen
D.
Phosphorus
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ANSWER :
B. Sulphur (BaSO₄ formed since S²⁻ oxidised to SO₄²⁻)
5.
Which one does NOT respond to Tollens' or Fehling's test?
A.
Formaldehyde
B.
Glucose
C.
Acetaldehyde
D.
Acetone (a ketone)
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ANSWER :
D. Acetone (a ketone)
6.
Carboxylic acid (RCOOH) is reduced to primary alcohol (RCH₂OH) by:
A.
LiAlH₄ (lithium aluminium hydride)
B.
Tollens' reagent
C.
NaBH₄
D.
Fehling's reagent
😑 View Answer Rough Work Error
ANSWER :
A. LiAlH₄ (lithium aluminium hydride)