Amines(Nomenclature, Classification Structure, Basic Character,...) NEET Questions

Organic Chemistry - Organic Compounds Containing Nitrogen

Amines(Nomenclature, Classification Structure, Basic Character,...) MCQ Questions


13.
The IUPAC name of aniline (C₆H₅NH₂) is:
A.
Methanamine
B.
Toluenamine
C.
Aminobenzoic acid
D.
Benzenamine (or phenylamine)
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ANSWER :
D. Benzenamine (or phenylamine)
14.
In naming unsymmetrical secondary or tertiary amines (with different alkyl/aryl groups attached to nitrogen), the locant used to indicate that a substituent is directly attached to the nitrogen atom (rather than to the carbon chain) is:
A.
The prefix 'iso-'
B.
N (italicized capital N)
C.
A number based on carbon position (e.g., 2-)
D.
The Greek letter alpha (α)
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ANSWER :
B. N (italicized capital N)
15.
In amines, the nitrogen atom is generally considered to be:
A.
sp³ hybridized
B.
Non-hybridized
C.
sp hybridized
D.
sp² hybridized
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ANSWER :
A. sp³ hybridized
16.
Due to sp³ hybridization of the nitrogen atom, along with the presence of a lone pair of electrons, the geometry of a simple amine (such as methylamine) is described as:
A.
Linear
B.
Pyramidal (trigonal pyramidal)
C.
Trigonal planar
D.
Tetrahedral, with no lone pair present
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ANSWER :
B. Pyramidal (trigonal pyramidal)
17.
In an amine molecule, the lone pair of electrons present on the nitrogen atom is primarily responsible for the:
A.
Basic character of amines
B.
Sweet smell of certain amines
C.
Colour observed in some amine solutions
D.
High boiling point of amines compared to alkanes
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ANSWER :
A. Basic character of amines
18.
In the case of aromatic amines, such as aniline, the lone pair of electrons on the nitrogen atom can undergo:
A.
No interaction whatsoever with the aromatic ring
B.
Conversion into a covalent sigma bond with a ring carbon
C.
Complete transfer to form an ionic bond with the ring
D.
Delocalization (resonance) into the aromatic ring
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ANSWER :
D. Delocalization (resonance) into the aromatic ring