A) rotation around \[{{C}_{2}}-{{C}_{3}}\] double bond
B) rotation around \[{{C}_{3}}-{{C}_{4}}\] sigma bond
C) rotation around \[{{C}_{1}}-{{C}_{2}}\] bond
D) restricted rotation around > C = C < bond
Correct Answer: D
Solution :
Due to presence of > C = C < in butene-2, it shows restricted rotation. Hence, give two types of arrangements around the space of > C = C < as cis and trans forms.
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