Question

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Answer 1

Question 1 is A b/c molecules with sp3 hybridization are able to rotate so depending on their substituents and where the double bond forms, cis and trans isomers can be produced.

Question 2. Neither

Answer 2

positive. you said it yourself, "almost always," implying that not all the time alkenes can be classified as cis or trans.

this stems from you not fully understanding the relationship and mechanism of classifying an alkene as cis or trans. go back and study WHY alkenes are classified as cis and trans.

http://www.chem.ucalgary.ca/courses/350/orgnom/alkenes/alkenes-02.html

Answer 3

#2 There is symmetry on one side of the double bond so it will not be cis or trans (or E/Z).

Answer 4

no problem. good luck. remember, if you have the same substituents on the left or right, that alkene can not be classified as cis or trans ( or E/Z)