CBSE Class 12 Chemistry Alcohols Phenols and Ethers Assignment

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Assignment for Class 12 Chemistry Unit 11 Alcohols, Phenols And Ethers

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Unit 11 Alcohols, Phenols And Ethers Class 12 Chemistry Assignment

 
1. Haloalkanes undergo nucleophilic substitution reaction readily than haloarenes.
Ans: (aLlow bond dissociation enthalpy of R-X bond due to low s- character of C SP3
(b) Stability of carbocation by hyper conjugation of neighboring alkyl groups.
 
2. The b.pt of isomeric haloalkanes decreases increasing in branching of carbon chains.
Ans - As branching increases molecules becomes more compact and acquires a low surface area . Since strength of Vander waals forces are proportional to area of contact
between molecules,attractive forces decreases with branching.
 
3. Alcohols have higher boiling boint compared to hydrocarbons, ethers and halo compounds of comparable mass.
Ans: Due to presence of inter molecular H-bonding,which is either absent or very weak in other molecules.
 
4. Phenol is more acidic than alcohol
 
CBSE Class 12 Chemistry Alcohols Phenols and Ethers Assignment
 
The phenoxide ion is resonance stabilized due to (-) R effect of benzene ring. The alkoxide ion is less stable due to (+) I effect of –R group.
 
5. Aldehydes are more than reactives than ketones towards nucleophilic addition reactions.
Ans: (a) inductive effect of R groups reduces the electrophilicity of the C atom of carbonyl group in ketones
(b) steric hindrance: the approaching nucleophile suffers greater repulsion due to presence of two bulky-R groups in ketones.
 
6. Carboxylic acids have higher boiling points than aldehydes, ketones and alcohols of comparable molecular masses.
Ans- The C.A molecules form dimers which do not separate into monomers even in vapour phase.
 
7. Gabriel Phthalimide synthesis is not suitable for preparation of secondary and tertiary amines.
Ans- Since the reaction involves Sn2 mechanism, only a primary alkyl group can approach the sterically hindered Phthalimide ring .
 
8 pKb of aniline is more than that of methylamine.
Ans- Since the lone pair on the N-atom remains in conjugation with the benzene ring and is unavailable for donation. The basic character of methylamine is enhanced due to +I effect of –CH3 group.

9 Aniline does not undergo Friedel Crafts reaction.
Ans- Aniline is basic and reacts with anhyd. AlCl3 to form a salt which deactivates 6the benzene ring towards electrophilic substitution.

10 During esterification, water must be removed as soon as it is formed. H+
Ans- RCOOH + R’OH RCOOR’ + H2O If the by-product is not removed, it will cause backward reaction. The ester formed will breakdown giving poor yield.

LEVEL-2 QUESTIONS

Q1) Although phenoxide ion hasmore no. of resonating structures than carboxylate ion , even though carboxylic acid is a stronger acid why ?
Ans:- The phenoxide ion has non equivalent resonance structures in which–vecharge is at less electronegativeC atom and +ve charge as at more electronegative O-atom.
Incarboxylate ion –ve charge is delocalized on two electronegative O-atoms hence resonance is more effective and a stronger acid.
 
CBSE Class 12 Chemistry - Alcohols ,Phenols and Ethers Assignment
 
Q.2 Why Carboxylic acid have higher boiling point than alcohols as alcohol forms strongest intermolecular hydrogen bonding?
Ans. As Carboxylic acid forms a dimer due towhich their surface area incresesand forms strong intermolecular H-bondingIthaving more boiling point than alcohols.

Q.3 There are two-NH2groupin semicarbazide. However only one is involved in formation of semicarbazones. Why?
Ans.NH2-CO – NH – NH2
Dueto resonance one NH2groupundergoes or involved in resonance and hence can’t participate in the formation of semicarhazone.
N+H2=CO- – NH – NH2
Longpair of NH2group isnotinvolved inresonance and is available for nucleophillic attack

Q.4 Why does solubility decreases with increasing molecular mass in carboxyticacid?
Ans. Because ofincrease in alkyl chain length which is hydrophobic in nature. Hencesolubility decreases.

Q.5 Why are aldehydesare more reactive than ketones when undergo nucleophillic addition reaction?
Ans (a) + I effect:- The alkyl group in Ketones due totheir e-releasing character decrease the +ve charge on C-Atom and thus reduce its reactivity.            (b) Steric hinderance:- Due to sterichinderance i
 
CBSE Class 12 Chemistry - Alcohols ,Phenols and Ethers Assignment
 
 
 
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Unit 12 Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Aldehydes Ketons Carboxylic Acids Questions

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CBSE Class 12 Chemistry Unit 11 Alcohols, Phenols And Ethers Assignment

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Assignment for Chemistry CBSE Class 12 Unit 11 Alcohols, Phenols And Ethers

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Unit 11 Alcohols, Phenols And Ethers Assignment Chemistry CBSE Class 12

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Unit 11 Alcohols, Phenols And Ethers Assignment CBSE Class 12 Chemistry

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CBSE Chemistry Class 12 Unit 11 Alcohols, Phenols And Ethers Assignment

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