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plane of symmetry

i am getting option (a) but answer is (b) where i am going wrong please help SO IT IS OPTION A ONLY FOR ME BUT HOW B HAS PLANE OF SYMMETRY PLEASE HELP

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closed as off-topic by Tyberius, Mithoron, Mathew Mahindaratne, A.K., Jon Custer Jan 21 at 3:47

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    $\begingroup$ Please edit in your reasoning as to how did you obtain A and why's B wrong. It is far better to understand a concept than knowing an answer. $\endgroup$ – Avnish Kabaj Jan 19 at 4:26
  • $\begingroup$ What's to explain? That's right, (a) has a plane of symmetry, and (b) doesn't. $\endgroup$ – Ivan Neretin Jan 19 at 6:11
  • $\begingroup$ The meso cmp. must be member of a set with at least two optically active stereoisomers. $\endgroup$ – Alchimista Jan 19 at 10:05
  • $\begingroup$ Answer (a) is not optically active to begin with so it's not compound "A"!. $\endgroup$ – Mathew Mahindaratne Jan 19 at 21:37
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You are right that after (a) is hydrogenated the result is a meso compound. But, (a) is also a meso compound before hydrogenation, you can draw a mirror through the double bond; and so (a) misses the first part of the question. (b) satisfies both parts.

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