Which of the following is an unsaturated hydrocarbon?
A. Propane
B. Cyclohexane
C. Methane
D. Benzene
Answer: Option D
Solution (By JKExamLibrary)
Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms. Benzene (C6H6) has a ring structure with alternating double bonds (delocalized pi electrons), making it highly unsaturated. Cyclohexane, propane, and methane contain only single bonds and are saturated hydrocarbons.
Explanation:
In 1913, Niels Bohr modified Rutherford's model to explain atomic stability and emission spectra. He introduced the concept of quantized electron orbits (or energy levels), stating that electrons revolve in specific, fixed orbits without radiating energy, and they only emit or absorb energy when jumping between these discrete levels.
Explanation:
Oxidation is the gain of oxygen or loss of electrons. Here, Carbon (C) gains oxygen to form Carbon dioxide (CO₂), so Carbon is oxidized. Lead oxide (PbO) loses oxygen to form Lead (Pb), so PbO is reduced. This is a classic redox reaction where both processes occur simultaneously.
Explanation:
Groups (vertical columns) contain elements with the same number of valence electrons, leading to similar chemical properties. The modern table is based on atomic number; 7 periods exist; noble gases are in Group 18.
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