Assertion :All the C atoms of but-2-ene lie in one plane. Reason: Double-bond C atoms are $s p^{2}$ - hybridised.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
All the C atoms of but-2-ene lie in one plane.
Double-bond C atoms are $s p^{2}$ - hybridized.
As $s p^{2}$ hybridized C atoms are planar, they lie in one plane.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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