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


13.
Which reagent is used as a general test for carbonyl group?
A.
Schiff's reagent
B.
Fehling's solution
C.
Tollens' reagent
D.
2,4-Dinitrophenylhydrazine (2,4-DNP/Brady's reagent)
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ANSWER :
D. 2,4-Dinitrophenylhydrazine (2,4-DNP/Brady's reagent)
14.
Para-nitrobenzoic acid is more acidic than benzoic acid because:
A.
-NO₂ is electron-donating
B.
It's solid
C.
-NO₂ is electron-withdrawing (stabilizes -COO⁻ by -M and -I)
D.
It has more carbons
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ANSWER :
C. -NO₂ is electron-withdrawing (stabilizes -COO⁻ by -M and -I)
15.
Solubility of unknown in water but insoluble in ether suggests:
A.
Halide
B.
Polar compound: low MW alcohol, acid, amine, or ionic salt
C.
Ether
D.
Hydrocarbon
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ANSWER :
B. Polar compound: low MW alcohol, acid, amine, or ionic salt
16.
Propan-2-one is the IUPAC name of:
A.
Acetone (CH₃COCH₃)
B.
Methyl ethyl ketone
C.
Propanone-1
D.
Diethyl ketone
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ANSWER :
A. Acetone (CH₃COCH₃)
17.
Aniline is converted to which product on reaction with chloroform and KOH?
A.
Phenyl cyanide (C₆H₅CN)
B.
Phenyl isocyanide (C₆H₅NC)
C.
Phenyl ether
D.
Phenol
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ANSWER :
B. Phenyl isocyanide (C₆H₅NC)
18.
Ninhydrin test gives a:
A.
Yellow colour
B.
Red colour
C.
Blue/purple/Ruhemann's purple colour with α-amino acids
D.
No colour
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ANSWER :
C. Blue/purple/Ruhemann's purple colour with α-amino acids