Discussion
In which one of the following compounds, there is complete octet of central atom?
Answer: C
The central atom has a complete octet in \(\mathrm{SCl_{2}}\).
Sulphur has six valence electrons. In \(\mathrm{SCl_{2}}\) it forms two S-Cl bonds and keeps two lone pairs: 2 bond pairs and 2 lone pairs give 8 electrons around sulphur, a full octet.
The others fall short. Boron in \(\mathrm{BF_{3}}\) and aluminium in \(\mathrm{AlCl_{3}}\) (printed AlCL3) have only three bond pairs, 6 electrons. Beryllium in \(\mathrm{BeH_{2}}\) has two bond pairs, 4 electrons. LiCl is essentially ionic, and \(\mathrm{Li^{+}}\) has the two-electron (helium-like) configuration, not an octet.
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