12th Chemistry - Book Back Answers - Unit 11 Hydroxy Compounds And Eithers - English Medium Guides

  

 

Plus Two / 12th Chemistry - Book Back Answers - Unit 11 - English Medium

Tamil Nadu Board 12th Standard Chemistry - Unit 11: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 11 from the Tamil Nadu State Board 12th Standard Chemistry textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

    We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

    By going through this material, you’ll gain a strong understanding of Unit 11 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

• 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following 
• 2 Mark Questions: Answer briefly 
• 3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 12 students! Prepare well and aim for top scores. Thank you!

I. Multiple Choice Questions

1. An alcohol (x) gives blue colour in Victormeyer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?

a) CH₃ CH (OH) CH₂CH₃

b) CH₃ – CH (OH) – CH₃

b) CH₃ C (OH) (CH₃)₂

d) CH₃- CH₂ –CH (OH) – CH₂ – CH₃

Answer Key:

 

2. Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.

a) benzaldehyde

b) propanoic acid

c) methyl propanoate

d) acetaldehyde

Answer Key:

 

3.

The X is

a) 

b) 

c) 

d) None of these

Answer Key:

 

4. In the reaction sequence, Ethene $\stackrel{\mathbf{H}\mathbf{O}\mathbf{C}\mathbf{l}}{\mathbf{\to }}\mathbf{ }\mathbf{A}\mathbf{ }\stackrel{\mathbf{ }\mathbf{ }\mathbf{X}\mathbf{ }\mathbf{ }}{\mathbf{\to }}$ ethan-1,2 - diol. A and X respectively

are

a) Chloroethane and NaOH

b) ethanol and H₂SO₄

c) 2 – chloroethan -1-ol and NaHCO₃

d) ethanol and H₂O

Answer Key:

 

5. Which one of the following is the strongest acid

a) 2 - nitrophenol

b) 4 – chlorophenol

c) 4 – nitrophenol

d) 3 – nitrophenol

Answer Key:

 

6) 

on treatment with Con H₂SO₄, predominately gives

a) 

b) 

c) 

d) 

Answer Key:

 

7. Carbolic acid is

a) Phenol

b) Picric acid

d) benzoic acid

d) phenylacetic acid

Answer Key:

 

8. Which one of the following will react with phenol to give salicyladehyde after hydrolysis.

a) Dichloro methane

b) trichloroethane

c) trichloro methane

d) CO₂

Answer Key:

 

9. (CH₃)₃ -  C - CH(OH)CH₃  $\stackrel{\mathbf{C}\mathbf{o}\mathbf{n}{\mathbf{H}}_{\mathbf{2}}\mathbf{S}{\mathbf{O}}_{\mathbf{4}}\mathbf{ }}{\mathbf{\to }}$ X (major product)

a) (CH₃)₃ CCH = CH₂

b) (CH₃)2 C = C (CH₃)2

c) CH₂ = C(CH₃)CH₂ – CH₂ – CH₃

d) CH₂ = C(CH₃) – CH₂ – CH₂ – CH₃

Answer Key:

 

10. The correct IUPAC name of the compound, ${\mathbf{ }}_{}$

${\mathbf{H}}_{\mathbf{3}}\mathbf{C}\mathbf{-}\mathbf{ }\underset{\underset{\mathbf{C}\mathbf{l}}{\mathbf{|}}}{\mathbf{C}\mathbf{H}}\mathbf{-}\mathbf{ }\stackrel{\underset{\mathbf{|}}{\mathbf{C}{\mathbf{H}}_{\mathbf{3}}}}{\mathbf{C}\mathbf{H}}\mathbf{-}\mathbf{ }\underset{\underset{\mathbf{C}{\mathbf{H}}_{\mathbf{3}}}{\mathbf{|}}}{\mathbf{C}\mathbf{H}}\mathbf{-}\mathbf{ }\mathbf{C}{\mathbf{H}}_{\mathbf{2}}\mathbf{-}\mathbf{ }\mathbf{O}\mathbf{H}$

a) 4 – chloro – 2,3 – dimethyl pentan – 1-ol

b) 2,3 – dimethyl – 4- chloropentan -1-ol

c) 2,3,4 – trimethyl – 4- chlorobutan -1-ol

d) 4 – chloro – 2,3,4 – trimethyl pentan – 1-ol

Answer Key:

 

11. Assertion : Phenol is more acidic than ethanol

Reason: Phenoxide ion is resonance stabilized

a) both assertion and reason are true and reason is the correct explanation of assertion.

b) both assertion and reason are true but reason is not the correct explanation of

assertion.

c) assertion is true but reason is false

d) both assertion and reason are false.

Answer Key:

 

12. In the reaction Ethanol $\stackrel{\mathbf{P}\mathbf{C}{\mathbf{l}}_{\mathbf{5}}}{\mathbf{\to }}\mathbf{X}\stackrel{\mathbf{a}\mathbf{l}\mathbf{c}\mathbf{.}\mathbf{K}\mathbf{O}\mathbf{H}}{\mathbf{\to }}\mathbf{Y}\underset{\mathbf{298}\mathbf{K}}{\overset{{\mathbf{H}}_{\mathbf{2}}\mathbf{S}{\mathbf{O}}_{\mathbf{4}}\mathbf{/}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}}{\mathbf{\to }}}$

The ‘Z’ is

a) ethane

b) ethoxyethane

c) ethylbisulphite

d) ethanol

Answer Key:

 

13. The reaction

Can be classified as

a) dehydration

b) Williamson alcoholsynthesis

c) Williamson ether synthesis

d) dehydrogenation of alcohol

Answer Key:

 

14. Isopropylbenzene on air oxidation in the presence of dilute acid gives

a) C₆H₅COOH

b) C₆H₅COCH₃

c) C₆H₅COC₆H₅

d) C₆H₅ - OH

Answer Key:

 

15. Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction

Reason : In the case of phenol, the intermediate arenium ion is more stabilized by

resonance.

a) if both assertion and reason are true and reason is the correct explanation of assertion.

b) if both assertion and reason are true but reason is not the correct explanation of

assertion.

c) assertion is true but reason is false

d) both assertion and reason are false.

Answer Key:

 

16. HO CH₂ CH₂ – OH on heating with periodic acid gives

a) methanoic acid

b) Glyoxal

c) methanal

d) CO₂

Answer Key:

 

17. Which of the following compound can be used as artifreeze in automobile radiators?

a) methanol

b) ethanol

c) Neopentyl alcohol

d) ethan -1, 2-diol

Answer Key:

 

18. The reactions

is an example of

a) Wurtz reaction

b) cyclic reaction

c) Williamson reaction

d) Kolbe reactions

Answer Key:

 

19. One mole of an organic compound (A) with the formula C₃H₈O reacts completely with two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z

answers the iodoform test. The compound (A) is

a) propan – 2-ol

b) propan -1-ol

c) ethoxy ethane

d) methoxy ethane

Answer Key:

 

20. Among the following ethers which one will produce methyl alcohol on treatment with hot HI?

a) (H3C)3 C – O – CH3

b) (CH3)2 – CH – CH2 – O - CH3

c) CH3 (CH2)3 – O – CH3

d) $\mathbf{C}{\mathbf{H}}_{\mathbf{3}}\mathbf{-} {\mathrm{CH}}_2- \underset{\underset{\mathbf{C}{\mathbf{H}}_{\mathbf{3}}}{|}}{\mathrm{CH}}- \mathrm{O}- \mathbf{C}{\mathbf{H}}_{\mathbf{3}}$

Answer Key:

 

21. Williamson synthesis of preparing dimethyl ether is a / an /

a) SN¹ reactions

b) SN² reaction

c) electrophilic addition

d) electrophilic substitution

Answer Key:

 

22. On reacting with neutral ferric chloride, phenol gives

a) red colour

b) violet colour

c) dark green colour

d) no colouration.

Answer Key:

 

 

II. Short Answer Questions.

12th Chemistry

III. Long Answer Questions. 

12th Chemistry

IV. Exercise.   

12th Chemistry