Q. Which of the following statements about the periodic table is true?
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A.
Elements in the same group have similar chemical properties.
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B.
Elements in the same period have similar atomic masses.
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C.
Noble gases are highly reactive.
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D.
Metals are located on the right side of the periodic table.
Solution
Elements in the same group have similar chemical properties due to having the same number of valence electrons.
Correct Answer: A — Elements in the same group have similar chemical properties.
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Q. Which reaction mechanism is primarily involved in the nucleophilic substitution of alkyl halides?
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A.
SN1
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B.
SN2
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C.
E1
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D.
E2
Solution
The SN2 mechanism involves a direct nucleophilic attack on the alkyl halide, resulting in a one-step substitution reaction.
Correct Answer: B — SN2
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Q. Which type of bond is formed by the sharing of electron pairs between atoms?
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A.
Ionic bond
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B.
Covalent bond
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C.
Metallic bond
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D.
Hydrogen bond
Solution
A covalent bond is formed when two atoms share one or more pairs of electrons.
Correct Answer: B — Covalent bond
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