Which of the following isomeric dienes is chiral?

2, 3 - p e n t a d i e n e

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3 - m e t h y l - 1, 2 - b u t a d i e n e

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2 - m e t h y l - 1, 3 - b u t a d i e n e

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None, all are achiral

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Solution

The correct option is D $2, 3 - p e n t a d i e n e$
Alkenes with 2 C=C double bonds in a row are called cumulated dienes or allenes. When the two outer doubly bound carbons each have two different groups attached then the molecule lacks a plane of symmetry and is chiral.
Hence option A is correct.

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