isomers

[inaccensa]

1 5 . How many structural isomers of C3H6Br2 are capable
of exhibiting optical activity?
A . 1
B . 2
C . 3
D . 4

I was really confused. The answer is A???

Place each Br on C1 and C2, C2 and C3, C1 and C3, wouldnt they all result in optical activity?

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[PingPongPro]

Br on c1 and c2 is the same molecule as the Br on c2 and c3.

Br on c1 and c3 does not show optical activity due to symmetry.

 

[tendiw]

watch for meso compounds (internal plane of symmetry), they tend to be the cause of confusion because they may be sometimes hard to spot