Are these chairal or achiral?

Classify the following molecule as either chiral or achiral.

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a chiral

b achiral

Unanswered

Problem $4\mathrm{.}29$h

Homework $*$ Unanswered $*$ Due Today, $11$:$59$ PM

Classify the following molecule as either chiral or achiral.

Select an answer and submit. For keyboard navigation, use the up$/$down arrow keys to select an answer.