Question

Why alkynes don't exhibit geometrical isomerism?

Answer 1

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here is your answer.

Alkynes have linear shape and therefore, do not show geometrical isomerism.

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Answer 2

Sigma bonds can rotate around and shift. ..pi bonds like those in double can freely move around . since each carbon in a double bond chain can from another bond that doesn't move you can create symmetrical isomers . Alkyne are linear and can't have a substitute atom branching off