NCERT Exemplar Chemistry

Question

Assertion: Bond angle in ethers is slightly less than the tetrahedral angle.
Reason: There is a repulsion between the two bulky (—R) groups. A). Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. B). Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. C). Assertion is a correct statement but Reason is a wrong statement. D). Assertion is a wrong statement but Reason is a correct statement.

Edvaya · Accepted Answer

The correct answer is Assertion is a wrong statement but Reason is a correct statement.. The Assertion is a wrong statement because the bond angle in ethers is actually slightly greater than the normal tetrahedral angle (e.g., in dimethyl ether, it is about $111.7^\circ$). The Reason is a correct statement; it is precisely the steric repulsion between the two bulky alkyl (—R) groups that pushes the bonds apart, making the angle larger than $109.5^\circ$.

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Chemistry > Organic Chemistry > Alcohols Phenols And Ethers

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