CBSE Class 12 Chemistry Alcohols Phenols and Ethers Assignment

CBSE Class 12 Chemistry Alcohols Phenols and Ethers Assignment. Students are advised to refer to the attached assignments and practise them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice.
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 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 .
Please click the link below to download CBSE Class 12 Chemistry Alcohols Phenols and Ethers Assignment



Click to View or Download pdf file
Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

The CBSE Science Challenge 2020

The CBSE Science Challenge - 2020 Science is inexplicably linked with our lives and helps us to understand the world around us better. Scientific and technological developments contribute to progress and help improve our standards of living. By engaging with this...

BRICS International Online Mathematics Competition

BRICSMATH.COM is an annual International Online Competition in Mathematics, for students of classes I – XII of 07 BRICS countries (Brazil, Russia, India, China and South Africa, Indonesia and Vietnam). The competition is held online on the website and...

Digital Marks Sheets Migration Certificates and Pass Certificates

CBSE pioneered in providing digital academic documents through its academic repository called “Parinam Manjusha” and DigiLocker.  As on now result data from 2004 till this year is available in the repository.  Approx. 12 crores digital academic documents are available...

Celebration of Republic Day by CBSE

As you are aware, Republic Day is celebrated every year on 26th January to honour the Constitution and Republic of our country. Celebration of this occasion annually helps youth and children of our country to be aware of the significance of Indian Constitution, unity...

Tricks for Utilization of additional time introduced in CBSE Board Exams

Tricks for Proper Utilization of Add-On 15 Minutes introduced in CBSE Board Exams The intend of this article is to share the best suggestions and guidelines to utilize the extra 15 minutes provided for reading the question paper in CBSE Board Examination. These extra...

How to Effectively Answer CBSE Board Examination Question Papers

The intend of this article is to share the best ways to answer the CBSE Board Examination. Usually most of the students tend to become nervous at the times of the board examination. In this article we will share the most effective ways to make the answers to the CBSE...

Studies Today