Question
BeF2 molecule is linear while SF2 is angular through both are triatomic?
✓
Answer
In BeF2, Be is the central atom and is surrounded by 2 bond pairs only therefore, the molecule is linear. On the other hand, in SF2, the central atom S is surrounded by 2 bond pairs and 2 lone pairs. Since at is surrounded by 4 electron pairs, the geometry is expected to be tetrahedral with two position occupied by lone pairs.
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$
\begin{array}{l}
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\end{array}
$
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\begin{array}{l}
2 C(s)+2 H_2(g)=C_2 H_4(g) ; \Delta H=52.6 kJ \\
C(s) \rightarrow C(g) ; \Delta H=716.68 kJ \\
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\text { and } C-H \text { bond energy }=+413 kJ
\end{array}
$
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