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Bond Length

Assertion : C...

Question

Assertion : Carbon-oxygen bonds are of equal length in acetate ion.
Reason : Bond length decreases with the multiplicity of bond between two atoms.

A

Assertion is true, Reason is true and Reason is correct explanation for Assertion

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B

Assertion is true, Reason is true and Reason is NOT the correct explanation for Assertion

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C

Assertion is true, Reason is false

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D

Assertion is false Reason is true

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Solution

The correct option is B Assertion is true, Reason is true and Reason is NOT the correct explanation for Assertion
Acetate ion forms a resonance structure where the negative charge is delocalized over all three atoms and therefore, two carbon-oxygen bonds are of equal length. The negative charge is spread over the end of the molecule equally. The two bonds are shorter than a single bond but longer than double bond.
Bond length decreases with multiplicity of bond between two atoms. For example, bond length of ethane > ethene > ethyne.
Hence, assertion is true, reason is true and reason is not the correct explanation for assertion.

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