Class 12 Chemistry

Magical Series Assignment

Organic Reasoning – Set 2

 

Write reasons for the following …

Q.1.     Phenol has a smaller dipole moment than methanol.

Q.2.     p-Dichlorobenzene has zero dipole moment, while p-dihydroxy benzene has definite dipole moment.

Q.3.     p- isomer of a compound is less soluble in a given solvent than the m- and o-isomers.

Q.4.     Phenol is a stronger acid than alcohol. [ OR ] Phenol is more acidic than ethanol.

Q.5.     Phenol does not give protonation reaction readily.

Q.6.     o-Nitrophenol has lower boiling point than p-nitrophenol.

Q.7.     The C–O bond is much shorter in phenol than in ethanol.

Q.8.     Although phenoxide ion has more resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol.

Q.9.     o-Nitrophenol is more acidic than o-methoxyphenol.

Q.10. o- and p-nitrophenols are more acidic than phenol.

Q.11. m-Aminophenol is a stronger acid than o-Aminophenol.

Q.12. The –OH group attached to a carbon in the benzene ring activates the benzene ring towards electrophilic substitution.

Q.13. Alcohols are more soluble in water than the hydrocarbons of comparable molecular masses.

Q.14. Lower alcohols are soluble in water, while higher alcohols are not.

Q.15. Alcohols act as weak bases.

Q.16. Boiling point of ethanol is higher than that of methanol.

Q.17. Boiling points of alcohols decrease with increase in branching of the alkyl chain.

Q.18. (±)-2-Butanol is optically inactive.

Q.19. Methanol boils at higher temperature than methyl amine.

Q.20. Methanol is miscible with water while iodomethane is not.

Q.21. Boiling point of ethers are lower than isomeric alcohols.

[ OR ] Ethers have low boiling points.

[ OR ] Ethanol has higher b.p. than methoxymethane.

Q.22. Preparation of ethers by acid dehydration of 2° or 3° alcohols is not a suitable method.

Q.23. Phenyl methyl ether reacts with HI to give phenol and methyl iodide.

Q.24. The alkoxy group in aryl alkyl ethers directs the incoming substituents to ortho and para-positions in benzene ring.

 

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