11th Chemistry - Book Back Answers - Unit 13 - English Medium Guides

 

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Tamil Nadu Board 11th Standard Chemistry - Unit 13 : Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 13 – Chemistry from the Tamil Nadu State Board 11th 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 Chemistry Unit 13 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 11 students! Prepare well and aim for top scores. Thank you!

Unit 13 :Hydrocarbons

I. Choose the best answer.

1.The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is (NEET)
a) the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain.
b) the staggered conformation of ethane is more stable than eclipsed conformation,
because staggered conformation has no torsional strain.
c) the staggered conformation of ethane is less stable than eclipsed conformation,
because staggered conformation has torsional strain.
d) the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has no torsional strain.
Answer Key:
b) the staggered conformation of ethane is more stable than eclipsed conformation,
 
2. C₂H₅ Br + 2Na $\stackrel{\mathrm{dry} \mathrm{ether}}{\to }$C₄H₁₀ + 2NaBr The above reaction is an example of which of the following
a) Reimer Tiemann reaction
b) Wurtz reaction
c) Aldol condensation
d) Hoffmann reaction
Answer Key:
b) Wurtz reaction
 
3.An alkyl bromide (A) reacts with sodium in ether to form 4, 5–diethyloctane, the compound (A) is
a) CH₃ (CH₂)₃ Br
b) CH₃(CH₂)₅ Br
c) CH₃(CH₂)₃ CH(Br)CH₃
d) CH₃ – (CH₂)₂ – CH (Br)$\mathbf{-}\underset{\underset{\mathbf{C}{\mathbf{H}}_{\mathbf{3}}}{\mathbf{|}}}{\mathbf{C}{\mathbf{H}}_{\mathbf{2}}}$
Answer Key: 

d) CH₃ – (CH₂)₂ – CH (Br)$\mathbf{-}\underset{\underset{\mathbf{C}{\mathbf{H}}_{\mathbf{3}}}{\mathbf{|}}}{\mathbf{C}{\mathbf{H}}_{\mathbf{2}}}$

 
4.The C – H bond and C – C bond in ethane are formed by which of the following types of overlap
a) sp³ – s and sp³ – sp³
b) sp² – s and sp² – Sp²
c) sp – sp and sp – sp
d) p – s and p – p
Answer Key:
a) sp³ – s and sp³ – sp³
 
5.In the following reaction, 

The major product obtained is

Answer Key:

 

6.Which of the following is optically active

a) 2 – methyl pentane
b) citric acid
c) Glycerol
d) none of of these
Answer Key:
d) none of of these
            
7. The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are
a) CH₄ and H₂
b) CH₄ and CO2
c) C₂H₆ and CO₂
d) C₂H₄ and Cl₂
Answer Key:
c) C₂H₆ and CO₂
 
8. The general formula for cyclo alkanes
a) C_nH_n
b) C_nH2_n
c) C_n H2_n–2
d) C_n H2_n+2 

Answer Key:
b) C_nH2_n
 
9. The compound that will react most readily with gaseous bromine has the formula (NEET)
a) C₃H₆
b) C₂H₂
c) C₄H₁₀
d) C₂H₄
Answer Key:
a) C₃H₆
 
10. Which of the following compounds shall not produce propene by reaction with HBr followed by elimination (or) only direct elimination reaction
(NEET)
a)$\mathbf{ ▽}$
b) CH₃ – CH₂ – CH₂ – OH
c) H₂C = C = 0
d) CH₃ – CH₂ – CH₂Br
Answer Key:
c) H₂C = C = 0
  
11. Which among the following alkenes on reductive ozonolysis produces only propanone ?
a) 2 – Methyl propene
b) 2 – Methyl but – 2 - ene
c) 2, 3 – Dimethyl but – 1 – ene
d) 2, 3 – Dimethyl but – 2 – ene
Answer Key:
d) 2, 3 – Dimethyl but – 2 – ene
 
12. The major product formed when 2 – bromo – 2 – methyl butane is refluxed with ethanolic KOH is
a) 2 – methylbut – 2 – ene
b) 2 – methyl butan – 1 – ol
c) 2 – methyl but – 1 – ene
d) 2 – methyl butan – 2 – ol
Answer Key:
a) 2 – methylbut – 2 – ene
 
13. Major product of the below mentioned reaction is,
(CH₃)₂ C = CH₂ $\stackrel{\mathbf{I}\mathbf{C}\mathbf{I}}{\mathbf{\to }}$
a) 2–chloro –1– iodo – 2 – methyl propane
b) 1–chloro–2–iodo–2–methylpropane
c) 1,2 – dichloro – 2 – methyl propane
d) 1, 2 – diiodo – 2 – methyl propane
Answer Key:
a) 2–chloro –1– iodo – 2 – methyl propane
 
14. The IUPAC name of the following compound is

a) trans–2–chloro–3–iodo – 2 – pentene
b) cis–3 – iodo – 4 – chloro – 3 – pentane
c) trans–3–iodo–4–chloro – 3 – pentene
d) cis–2 – chloro – 3 – iodo – 2 – pentene
Answer Key:
a) trans–2–chloro–3–iodo – 2 – pentene
 
15. Cis – 2 – butene and trans – 2 – butane are
a) conformational isomers
b) structural isomers
c) configurational isomers
d) optical isomers
Answer Key:
c) configurational isomers
 
 
16. Identify the compound (A) in the following reaction 

Answer Key: 

 

17.$\underset{\underset{\mathbf{B}\mathbf{r}}{\mathbf{|}}}{\mathbf{C}{\mathbf{H}}_{\mathbf{2}}}\mathbf{-}\underset{\underset{\mathbf{B}\mathbf{r}}{\mathbf{|}}}{\mathbf{C}{\mathbf{H}}_{\mathbf{2}}}\stackrel{\mathbf{\left(}\mathbf{A}\mathbf{\right)}}{\mathbf{\to }}\mathbf{C}\mathbf{H}\mathbf{\equiv }\mathbf{C}\mathbf{H}$
a) Zn
b) Conc H₂SO₄
c) alc. KOH
d) dil H₂SO₄
Answer Key:
c) alc. KOH
 
18. Consider the nitration of benzene using mixed con H₂SO₄ and HNO₃ if a largem quantity of KHSO₄ is added to the mixture, the rate of nitration will be
a) unchanged
b) doubled
c) faster
d) slower
Answer Key:
d) slower
 
19. In which of the following molecules, all atoms are co-planar 

Answer Key:
d) both (a) and (b) 
 
20. Propyne on passing through red hot iron tube gives 

Answer Key: 

21. 

Answer Key:

22. Which one of the following is non aromatic ? 

Answer Key: 

 

23. Which of the following compounds will not undergo Friedal – crafts reaction easily ? (NEET)
a) Nitro benzene
b) Toluene
c) Cumene
d) Xylene
Answer Key:
a) Nitro benzene
 
24. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?
a) – COOH
b) – NO₂
c) – C ≡ N
d) – SO₃H
Answer Key:
b) – NO₂
 
25. Which of the following can be used as the halide component for friedal – crafts reaction ?
a) Chloro benzene
b) Bromo benzene
c) chloro ethene
d) isopropyl chloride
Answer Key:
d) isopropyl chloride
 
26. An alkane is obtained by decarboxylation of sodium propionate. Same alkane can be prepared by
a) Catalytic hydrogenation of propene
b) action of sodium metal on iodomethane
c) reduction of 1 – chloro propane
d) reduction of bromomethane
Answer Key:
b) action of sodium metal on iodomethane
 
27. Which of the following is aliphatic saturated hydrocarbon
a) C₈ H₁₈
b) C₉ H₁₈
c) C₈ H₁₄
d) All of these
Answer Key:
a) C₈ H₁₈
 
28. Identify the compound 'Z' in the following reaction
${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}\underset{623\mathrm{K}}{\overset{{\mathrm{Al}}_2{\mathrm{O}}_3}{\to }}\mathrm{X}\stackrel{{\mathrm{O}}_3}{\to }\mathrm{Y}\stackrel{\mathrm{Zn}/{\mathrm{H}}_2\mathrm{O}}{\to }\left(\mathrm{Z}\right)$
a) Formaldehyde
b) Acetaldehyde
c) Formic acid
d) none of these
Answer Key:
a) Formaldehyde
 
29. Peroxide effect (Kharasch effect) can be studied in case of
a) Oct – 4 – ene
b) hex – 3 – ene
c) pent – 1 – ene
d) but – 2 – ene
Answer Key:
c) pent – 1 – ene
 
30. 2 – butyne on chlorination gives
a) 1 – chloro butane
b) 1, 2 – dichloro butane
c) 1, 1, 2, 2 – tetrachlorobutane
d) 2, 2, 3, 3 – tetra chloro butane
Answer Key:
d) 2, 2, 3, 3 – tetra chloro butane 

 

II. Short Answer Questions

11th Chemistry

III. Long Answer Questions

11th Chemistry

IV. Exercise

11th Chemistry