Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 5

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Question 1
1 / -0

In phenols, the carbon-oxygen bond length is slightly ___________ than that in methanol.

A
More

B
Less

C
Similar

D
No angle is formed

Solution

In Phenols, the -OH group is attached to sp² hybridised carbon of an aromatic ring. The carbon-oxygen bond length(136 pm) in phenol is slightly less than that in methanol. This is due to (i) partial double bond character on account of the conjugation of unshared electron pair of oxygen with the aromatic ring and (ii) sp² hybridised state of carbon to which oxygen is attached.
Question 2
1 / -0

In Ethers, Bond Angle is slightly __________ than the tetrahedral angle?

A
Less

B
Similar

C
Greater

D
No angle is formed

Solution

In ethers, the four-electron pairs, i.e., the two bond pairs and two lone pairs of electrons on oxygen are arranged approximately in a tetrahedral arrangement. The bond angle is slightly greater than the tetrahedral angle due to the repulsive interaction between the two bulky (-R) groups. The C-O bond length (141 pm) is almost the same as in alcohols.