IB Chemistry SL 3.4.3 Heterolytic Fission Questions

Use real SL exam questions to represent heterolytic bond cleavage, assign ionic charges and distinguish it from homolytic fission.

Exam points

Show both bonding electrons moving to one atom with a full double-barbed curly arrow during heterolytic bond fission.
Assign a negative charge to the fragment receiving the electron pair and a positive charge to the other fragment, forming ions.
Distinguish ionic heterolysis from radical-forming homolysis in equations and diagrams.

[Maximum number: 1]

Which row correctly shows heterolytic fission?

$\mathrm{Br} \underset{\mathrm{Br}}{\curvearrowleft} \rightarrow \mathrm{Br}^{+}+\mathrm{Br}^{-}$

$\mathrm{Br} \underset{\mathrm{Br}}{\curvearrowleft} \rightarrow 2 \mathrm{Br}$ .

$\mathrm{Br} \stackrel{\mathrm{Br}}{\mathrm{Br}} \rightarrow \mathrm{Br}^{+}+\mathrm{Br}^{-}$

$\mathrm{Br} \stackrel{\mathrm{Br}}{\mathrm{Br}} \rightarrow 2 \mathrm{Br}$ .

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