It is a white crystalline solid that is volatile.The molecule consists of a phenyl group (−C 6 H 5) bonded to a hydroxy group (−OH).

ANS : Due to electron withdrawing effect of the benzene ring the C-O bond in phenol is less polar but in case of methanol due to electrondonating effect of CH3 group, CO bond is more polar. Sol. Phenol has smaller dipole moment than methanol. as a result it pushes electron towards the OH group resulting in increasing the dipole moment of the methanol. Q. In case of methanol only electron withdrawing inductive effect is operative. Ans. Phenol has smaller dipole moment than methanol. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online.

Solution: In phendl, C – O bond is less polar due to electron withdrawing effect of benzene ring, whereas in methanol C – O bond is more polar due to electron releasing effect of—CH 3 group.

Account for the following : (i) Phenol has a smaller dipole moment than methanol. hence it is less polar and have less dipole moment. (OR) Why are dipole moments of phenols smaller than dipole moments of alcohols ? ANS a. Why ?

(i). Phenol has smaller dipole moment than methanol.

it reduces the charge on OH group. methanol c atom is sp3 hybridization but for phenol it has sp2 hybridisation so its carbon atom is more stable than methanol and can pull the electron towards its nucleus besides +I effect it also have +R effect in which there is the dislocation of the lone pair of electron on oxygen atom.
The C — O — C bond in ethers like the C — OH bond in alcohols is quite strong. on the other hand, methanol has higher dipole moment as methyl group is an electron pushing group. i)Phenols has a smaller dipole moment than methanol ii)Phenols do not give protonation reactions readily. 12th Class Chemistry Sample Paper Chemistry Sample Test Paper-9 question_answer Account for the following : (a) Phenol has a smaller dipole moment than methanol.

Why? Give names of the reagents to bring about the following transformations i from PHARMACEUT PHRM 245 at KwaZulu-Natal Hence, it has higher dipole moment. Several small alcohols also have an appreciably higher dipole moment (~1.6 D) compared to phenol (1.2 D). so that why phenol has smaller dipole moment than methanol.

1 3.Write the structure of phenetole and give its IUPAC name 1 4. The Decreasing order of dipole moment is this way.

Since dipole moment is a product of charge and distance (here bond length), chlorobenzene having a shorter bond length will consequently have a lower dipole moment than cyclohexyl chloride. Dipole moment of phenol is smaller than that of methanol. ii) Due to resonance in phenol, O acquires +ve charge, there is decrease in the electron density on –OH, increasing acidic nature, hence has less pka value than alcohol Ans 11. 11. 1 - MARK QUESTIONS 1. Phenol has only moderate solubility in water, while ethanol and other small alcohols are infinitely miscible. Why phenol has smaller dipole moment than methanol? ix) Sodium metal can be used for drying diethyl ether and benzene but not for an alcohol. Phenol is an aromatic organic compound with the molecular formula C 6 H 5 OH. In phenol the electron withdrawing inductive effect of –OH group is opposed by electron releasing the resonance effect of –OH.
Hence, the dipole moment of phenol (1.54 D) is smaller than that of methanol (1.71 D). This smaller dipole moment of phenol is due to the electron attracting effect of phenyl group in …

Prob 3. 1 2. viii) Acid catalysed dehydration of t-butanol is faster than n-butanol. length in phenol (136pm) is slightly less than in methanol(412pm) due to resonance in aromatic ring of phenol Phenol has dipole moment 1.54D where as methanol has dipole moment 1.71D. 3. Account for the following: i) Phenols has a smaller dipole moment than methanol ii) Phenols do not give protonation reactions readily. Why are …

Methanol and Pyridine.

In case of phenol, the electron withdrawing inductive effect of oxygen is opposed by electron releasing resonance effect. it is because phenyl group is a electron withdrawing group.


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