(A) In ethers, bond angle C – O – C is more than tetrahedral angle
(R) Steric repulsive interaction between two bulky alkyl groups is more than lp-lp repulsions around oxygen atom

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

‘A’ is false and ‘R’ is false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

‘A’ is true and ‘R’ is false

answer is A.

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Detailed Solution

In Ether, O atom is bonded with alkyl group on both sides. There are two lone pairs of electrons on oxygen atom and as the size of O is small, the alkyl group are closer to each other.

This causes two factors, one is repulsion between lone-pairs of oxygen and steric hinderance between alkyl group, out of which steric factor is more dominating and to minimize this factor, the C-O-C bond arrange itself in such a way that the bond angle between C-O-C is more than tetrahedral angle.

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