The solution is incorrect, all alkyl derivatives of cyclopropane could react with bromine. The correct answer is three (i.g B).
Perhaps it's a sample test, not final test. The sample test is only for reference, it didn't help you so much in the final test. For the final, you should training your English (especially English for chemistry) carefully.
Sorry I can't use Vietnamese as usual, the font isn't good T_T
Trích:
Nguyên văn bởi minhduy2110
ánh sáng, Br2 khí.
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Note here ku: decolourise bromine water under the usual conditions
Although cyclopropane and cyclobutane have similar strain energies, they differ
markedly in their reactivity toward electrophiles.
Thus, whereas cyclopropane
reacts readily with bromine to give 1,3-dibromopropane, cyclobutane does not react with bromine.
[b]Ref:
Robert A. Moss, Matthew Platz, Maitland Jones., Reactive intermediate chemistry., Wiley, 2004