DAT destroyer OC #155 allene is optically active?

[jeromedr]

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can anyone explain why allene is optically active in question 155 of DAT destroyer - 2016 version

 

[Lnguyen7]

What kind of allene?

 

[DAT Destroyer]

can anyone explain why allene is optically active in question 155 of DAT destroyer - 2016 version

Examine both “ends” of the allene. If either of those ends is attached to two identical substituents, it is achiral – because it will have a mirror plane. If neither of the ends are attached to two identical substituents, then it is chiral.

Hope this helps.

Dr. Romano

 

[jeromedr]

ok awesome thank you for the help,
another question, #283 I'm confused by the differences in answer choice A vs answer E , and why is E correct vs A they appear to be the same thing? could you clarify