12th Standard Syllabus & Materials

12th Standard

TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

NEW

12th Standard

TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard English Medium Chemistry Subject Hydroxy Compounds and Ethers Creative 3 Mark Questions with Solution Part - I

Published on: 21/06/2021

QB365 provides detailed and simple solution for every Creative Questions in class 12 Chemistry Subject. It will helps to get more idea about question pattern in
every Creative questions with solution.

Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

Take MCQ Chemistry Test

QB365 Student Learing Managemnet System

Std: 12th Standard - Chemistry

chapter: - Creative Questions

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Generic 3

5 x 3 = 15

Give the IUPAC names of each of the following and classify them as 1°, 2° and 3°
(a) CH₃(CH₂)₃CHOHCH(CH₃)₂
(b) (CH₃)₃C-CH₂OH
(c) \(({ CH }_{ 3 })_{ 2 }\underset { \overset { | }{ { C }_{ 6 }{ H }_{ 5 } } }{ C } -OH\)
(d) \(BrCH_{ 2 }-\underset { \overset { | }{ OH } }{ { CH }_{ 2 } } -CH-C({ CH }_{ 3 })_{ 3 }\)
(e) CH₂=CH-CHOHCH
(f) PhCH₂OH
(g) HOCH₂CH₂CH₂CH₂C₆H₅
(h) (C₂H₅)₃COH

Identify the isomerism in each of the following pairs.
CH₃OCH₂OCH₃ and CH₃OCH₂CH₂OH
CH₃CH(OH)CH₂OH and CH₂OHCH₂CH₂OH
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }-OH\) and CH₃-CH₂-CH₂-CH₂OH

Give a brief account of the following reaction: Etherification.

How is glycerol obtained commercially? State its uses.

Why is that tertiary alcohols show greater reactivity towards hydrogen halides than secondary and primary alcohols?

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Generic 3

5 x 3 = 15

(a) 2-methyl-heptan-3-ol (2°)
(b) 2,2-dimethyl-propan-1-01-(1°)
(c) 2-phenyl-2-propanol (3°)
(d) 2,2-dimethyl-S-bromo-3-pentanol (2°)
(e) l-Butene-ol (2°)
(f) Phenyl methanol (1°)
(g) 4-phenyl-1-butanol (1°)
(h) 3-ethyl-3-pentanol (3°)

Functional isomerism.
(a) dimethoxy methane
(b) 2-methoxy ethonal
Position isomerism - diol position is changed.
(a) propane - 1,2-diol
(b) propane - 1,3 - diol
Chain isomerism - carbon chain is changed
(a) isobutyl alcohol
(b) n-butyl alcohol

When an alkyl halide is heated with an alcoholic solution of sodium alkoxide, the corresponding ethers are obtained. The reaction involves SN² mechanism.

Primary alkyl halides are more susceptible for SN² reaction. Hence for the preparation of mixed having primary and tertiary alkyl group, primary alkyl halide and tertiary alkoxide are used. On the other hand, if we use tertiary alkyl halide and primary alkoxide, elimination dominates and succedes over substitution to form an alkene.

(i) Glycerol is prepared in a large scale by the hydrolysis of oils or fats either by using alkali or by super heated steam.
(ii) During this process, soap is formed along with the byproduct glycerol and this process is called saponification.

Uses of glycerol:
(i) Glycerol is used as a sweetening agent in confectionery and beverages.
(ii) It is used in the manufacture of cosmetics and transparent soaps.
(iii) It is used in making printing inks and stamp pad ink and lubricant for watches and clocks.
(iv) It is used in the manufacture of explosive like dynamite and cordite by mixing it with chaina clay.

(i) Reaction of alcohols with HX involves the cleavage of C-OH bond of alcohols (3⁰>2⁰>1⁰).
This is due to the electron releasing inductive effect of alkyl groups and thus the electron density towards oxygen gets increased.
(ii) As a result the polarity of C-O bond increases making the cleavage between the C and O easier.
(iii) Hence, greater the number of alkyl groups on carbon, more easy would be the cleavage of C-O bond and thus greater would be the reactivity of alcohol.