This smaller dipole moment of phenol is due to the electron attracting effect of phenyl group in … it reduces the charge on OH group. Hence, phenol has smaller dipole moment. Account for the following: i) Phenols has a smaller dipole moment than methanol ii) Phenols do not give protonation reactions readily. vii) Symmetrical ethers also possess a net dipole moment. 1 - MARK QUESTIONS 1. Sol. Hence, it has higher dipole moment. Thus the C-Cl bond in chlorobenzene is shorter than the C-Cl bond in cyclohexyl chloride.

3. The Decreasing order of dipole moment is this way. 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. ix) Sodium metal can be used for drying diethyl ether and benzene but not for an alcohol. Q20. Dipole moment of phenol is smaller than that of methanol. Phenol has smaller dipole moment than methanol. Methanol and Pyridine. Why phenol has smaller dipole moment than methanol? Phenol is an aromatic organic compound with the molecular formula C 6 H 5 OH.

1 3.Write the structure of phenetole and give its IUPAC name 1 4. Explanation: The nitro group obviously Attracts electrons and results in higher dipole moment.

Hence, the dipole moment of phenol (1.54 D) is smaller than that of methanol (1.71 D).

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. Several small alcohols also have an appreciably higher dipole moment (~1.6 D) compared to phenol (1.2 D). 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 electron-donating effect of — CH 3 group, C — so that why phenol has smaller dipole moment than methanol. Why ? Explain why dehydration of alcohols to form alkenes is always carried out with from KIM 327 at Anadolu University 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. Ans. v) Phenol has a smaller dipole moment than methanol. 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. Nitrobenzene, phenol,phenylamine,methylbenzene. it is because phenyl group is a electron withdrawing group. 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. 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. In phenol the electron withdrawing inductive effect of –OH group is opposed by electron releasing the resonance effect of –OH. $\endgroup$ – Nicolau Saker Neto Dec 2 '15 at 11:20 as a result it pushes electron towards the OH group resulting in increasing the dipole moment of the methanol. In phenol the electron withdrawing inductive effect of –OH group is opposed by electron releasing the resonance effect of –OH. 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. 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. Prob 3.

1 (b) Unlike phenols, alcohols are easily protonated. OR Why are dipole moments of phenols smaller that dipole moments of alcohols. In case of methanol only electron withdrawing inductive effect is operative. Q. vi) Acidity of alcohols follows the order: 1°>2°>3°. 11.


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