Tamil Nadu Board of Secondary EducationHSC Science Class 11th

# Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 13 - Hydrocarbons [Latest edition]

## Chapter 13: Hydrocarbons

Choose the best answer [Pages 220 - 223]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 13 HydrocarbonsChoose the best answer [Pages 220 - 223]

Choose the best answer | Q I. 1. | Page 220

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is ______.

• The eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain.

• The staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain.

• The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain.

• The staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has no torsional strain.

Choose the best answer | Q I. 2. | Page 220

$\ce{C2H5Br + 2Na ->[dry ether]C4H10 + 2NaBr}$

The above reaction is an example of which of the following.

• Reimer Tiemann reaction

• Wurtz reaction

• Aldol condensation

• Hoffmann reaction

Choose the best answer | Q I. 3. | Page 220

An alkyl bromide (A) reacts with sodium in ether to form 4, 5 – diethyloctane, the compound (A) is

• CH3(CH2)3Br

• CH3(CH2)5Br

• CH3(CH2)3 CH(Br)CH3

• $\begin{array}{cc}\ce{CH3 - (CH2)2 - CH(Br) - CH2}\\\phantom{.........................}|\\ \phantom{............................}\ce{CH3} \end{array}$

Choose the best answer | Q I. 4. | Page 220

The C – H bond and C – C bond in ethane are formed by which of the following types of overlap.

• sp3 – s and sp3 – sp3

• sp2 – s and sp2 – sp2

• sp – sp and sp – sp

• p – s and p – p

Choose the best answer | Q I. 5. | Page 220

In the following reaction,

The major product obtained is

Choose the best answer | Q I. 6. | Page 220

Which of the following is optically active?

• 2 – methyl pentane

• citric acid

• Glycerol

• none of of these

Choose the best answer | Q I. 7. | Page 221

The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are ______.

• CH4 and H2

• CH4 and CO2

• C2H6 and CO2

• C2H4 and Cl2

Choose the best answer | Q I. 8. | Page 221

The general formula for cyclo alkanes.

• CnHn

• CnH2n

• CnH2n-2

• CnH2n+2

Choose the best answer | Q I. 9. | Page 221

The compound that will react most readily with gaseous bromine has the formula (NEET) ______.

• C3H6

• C2H2

• C4H10

• C2H4

Choose the best answer | Q I. 10. | Page 221

Which of the following compounds shall not produce propene by reaction with HBr followed by elemination (or) only direct elimination reaction (NEET).

• $\ce{CH3 – CH2 – CH2 – OH}$

• $\ce{H2C = C = O}$

• $\ce{CH3 – CH2 – CH2Br}$

Choose the best answer | Q I. 11. | Page 221

Which among the following alkenes on reductive ozonolysis produces only propanone?

• 2 – Methyl propene

• 2 – Methyl but – 2 – ene

• 2, 3 – Dimethyl but – 1- ene

• 2, 3 – Dimethyl but – 2 – ene

Choose the best answer | Q I. 12. | Page 221

The major product formed when 2 – bromo – 2 – methyl butane is refluxed with ethanolic KOH is ______.

• 2 – methylbut – 2- ene

• 2 – methyl butan – 1 – ol

• 2 – methyl but – 1 – ene

• 2 – methyl butan – 2- ol

Choose the best answer | Q I. 13. | Page 221

Major product of the below mentioned reaction is, $\ce{(CH3 )2 C = CH2 ->[ICI]}$

• 2 – chloro – 1 – iode – 2 – methyl propane

• 1 – chloro – 2 – iodo – 2 – methyl propane

• 1, 2 – dichloro – 2 – methyl propane

• 1, 2 – diiodo – 2 – methyl propane

Choose the best answer | Q I. 14. | Page 221

The IUPAC name of the following compound is

$\begin{array}{cc} \phantom{........}\ce{Cl}\phantom{......}\ce{CH2 - CH3}\\\backslash\phantom{......}/\\ \ce{C = C}\\/\phantom{......}\backslash\\ \ce{H3C}\phantom{......}\ce{I} \end{array}$

• trans – 2- chloro – 3- iodo – 2- pentane

• cis – 3- iodo – 4 chloro – 3 – pentane

• trans – 3 – iodo – 4 – chloro – 3 – pentene

• cis – 2 – chloro – 3 iodo – 2 – pentene

Choose the best answer | Q I. 15. | Page 221

Cis – 2- butene and trans – 2 – butene are ______.

• conformational isomers

• structural isomers

• configurational isomers

• optical isomers

Choose the best answer | Q I. 16. | Page 221

Identify the compound (A) in the following reaction

Choose the best answer | Q I. 17. | Page 222

$\begin{array}{cc} \ce{CH2 - CH2 ->[(A)] CH ≡ CH}\\ |\phantom{.......}|\phantom{.................}\\ \ce{Br}\phantom{.....}\ce{Br}\phantom{.................} \end{array}$, where A is,

• Zn

• conc. H2SO4

• alc. KOH

• dil. H2SO4

Choose the best answer | Q I. 18. | Page 222

Consider the nitration of benzene using mixed con H2SO4 and HNO3 if a large quantity of KHSO4 is added to the mixture, the rate of nitration will be ______.

• unchanged

• doubled

• faster

• slower

Choose the best answer | Q I. 19. | Page 222

In which of the following molecules, all atoms are co-planar

• both and

Choose the best answer | Q I. 20. | Page 222

Propyne on passing through red hot iron tube gives

• none of these

Choose the best answer | Q I. 21. | Page 222

is

• both and

Choose the best answer | Q I. 22. | Page 222

Which one of the following is non aromatic?

Choose the best answer | Q I. 23. | Page 222

Which of the following compounds will not undergo Friedal – crafts reaction easily ? (NEET)

• Nitro benzene

• Toluene

• Cumene

• Xylene

Choose the best answer | Q I. 24. | Page 223

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

• – COOH

• – NO2

• -C ≡ N

• -SO3H

Choose the best answer | Q I. 25. | Page 223

Which of the following can be used as the halide component for friedal - crafts reaction?

• Chloro benzene

• Bromo benzene

• Chloro ethene

• Isopropyl chloride

Choose the best answer | Q I. 26. | Page 223

An alkane is obtained by decarboxylation of sodium propionate. Same alkane can be prepared by ______.

• Catalytic hydrogenation of propene

• action of sodium metal on iodomethane

• reduction of 1 – chloro propane

• reduction of bromomethane

Choose the best answer | Q I. 27. | Page 223

Which of the following is aliphatic saturated hydrocarbon?

• C8H18

• C9H18

• C8H14

• All of these

Choose the best answer | Q I. 28. | Page 223

Identify the compound 'Z' in the following reaction

$\ce{C2H6O ->[Al2O3][623 K] X ->[O3] Y ->[Zn/H2O] (Z)}$

• Formaldehyde

• Acetaldehyde

• Formic acid

• none of these

Choose the best answer | Q I. 29. | Page 223

Peroxide effect (Kharasch effect) can be studied in case of ______.

• Oct – 4 – ene

• hex – 3 – ene

• pent – 1 – ene

• but – 2 – ene

Choose the best answer | Q I. 30. | Page 223

2 – butyne on chlorination gives ______.

• 1 – chloro butane

• 1, 2 – dichloro butane

• 1, 1, 2, 2 – tetrachlorobutane

• 2, 2, 3, 3 – tetra chloro butane

Write brief answer to the following questions. [Pages 223 - 224]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 13 HydrocarbonsWrite brief answer to the following questions. [Pages 223 - 224]

Write brief answer to the following questions. | Q II. 1. 1) | Page 223

Give IUPAC name for the following compound.

$\ce{CH3 –CH=CH–CH=CH–C≡C–CH3}$

Write brief answer to the following questions. | Q II. 1. 2) | Page 223

Give IUPAC name for the following compound.

$\begin{array}{cc}\ce{C2H5}\phantom{.}\ce{CH3}\phantom{.......}\\|\phantom{.....}|\phantom{.........}\\ \ce{CH3 - C - C - C ≡ C - CH3}\\ |\phantom{.....}|\phantom{.........}\\ \ce{CH3}\phantom{..}\ce{H}\phantom{.........} \end{array}$

Write brief answer to the following questions. | Q II. 1. 3) | Page 223

Give IUPAC name for the following compound.

$\ce{(CH3)3 C – C ≡ C – CH (CH3)2}$

Write brief answer to the following questions. | Q II. 1. 4) | Page 223

Give IUPAC name for the following compound.

Ethyl isopropyl acetylene

Write brief answer to the following questions. | Q II. 1. 5) | Page 223

Give IUPAC name for the following compound.

$\ce{CH ≡ C – C ≡ C – C ≡ CH}$

Write brief answer to the following questions. | Q II. 2. | Page 223

Identify the compound A, B, C and D in the following series of reactions.

Write brief answer to the following questions. | Q II. 3. | Page 224

Write short notes on ortho, para directors in aromatic electrophilic substitution reactions.

Write brief answer to the following questions. | Q II. 4. | Page 224

How is propyne prepared from an alkylene dihalide ?

Write brief answer to the following questions. | Q II. 5. | Page 224

An alkyl halide with molecular formula C6H13Br on dehydro halogenation gave two isomeric alkenes X and Y with molecular formula C6H12. On reductive ozonolysis, X and Y gave four compounds CH3COCH3, CH3CHO, CH3CH, CHO and (CH3)2 CHCHO. Find the alkyl halide.

Write brief answer to the following questions. | Q II. 6. | Page 224

Describe the mechanism of Nitration of benzene.

Write brief answer to the following questions. | Q II. 7. | Page 224

How does Huckel rule help to decide the aromatic character of a compound?

Write brief answer to the following questions. | Q II. 8. 1) | Page 224

Suggest the route for the preparation of the following from benzene.

3 – chloro nitrobenzene

Write brief answer to the following questions. | Q II. 8. 2) | Page 224

Suggest the route for the preparation of the following from benzene.

4 – chlorotoluene

Write brief answer to the following questions. | Q II. 8. 3) | Page 224

Suggest the route for the preparation of the following from benzene.

Bromo benzene

Write brief answer to the following questions. | Q II. 8. 4) | Page 224

Suggest the route for the preparation of the following from benzene.

m - dinitro benzene

Write brief answer to the following questions. | Q II. 9. | Page 224

Suggest a simple chemical test to distinguish propane and propene.

Write brief answer to the following questions. | Q II. 10. | Page 224

What happens when Isobutylene is treated with acidified potassium permanganate?

Write brief answer to the following questions. | Q II. 11. i) | Page 224

How will you convert ethyl chloride into ethane?

Write brief answer to the following questions. | Q II. 11. ii) | Page 224

How will you convert ethyl chloride into n – butane?

Write brief answer to the following questions. | Q II. 12. | Page 224

Describe the conformers of n – butane.

Write brief answer to the following questions. | Q II. 13. | Page 224

Write the chemical equations for combustion of propane.

Write brief answer to the following questions. | Q II. 14. | Page 224

Explain Markow nikoff’s rule with suitable example.

Write brief answer to the following questions. | Q II. 15. | Page 224

What happens when ethylene is passed through cold dilute alkaline potassium permanganate.

Write brief answer to the following questions. | Q II. 16. 1) | Page 224

Write the structure of the following alkanes.

2, 3 – Dimethyl – 6 – (2 – methyl propyl) decane

Write brief answer to the following questions. | Q II. 16. 2) | Page 224

Write the structure of the following alkanes.

5 – (2 – Ethyl butyl) – 3, 3 – dimethyldecane

Write brief answer to the following questions. | Q II. 16. 3) | Page 224

Write the structure of the following alkanes.

5 – (1, 2 – Dimethyl propyl) – 2 – methylnonane

Write brief answer to the following questions. | Q II. 17. | Page 224

How will you prepare propane from a sodium salt of fatty acid?

Write brief answer to the following questions. | Q II. 18. | Page 224

Identify A and B.

Write brief answer to the following questions. | Q II. 19. i) | Page 224

Complete the following:

$\ce{2 - butyne ->[Lindlar Catalyst]}$

Write brief answer to the following questions. | Q II. 19. ii) | Page 224

Complete the following:

$\ce{CH2 = CH2 ->[I2]}$

Write brief answer to the following questions. | Q II. 19. iii) | Page 224

Complete the following:

$\begin{array}{cc} \ce{CH2 - CH2 ->[Zn/C2H5OH]}\\ |\phantom{.......}|\phantom{..............}\\ \ce{Br}\phantom{.....}\ce{Br}\phantom{..............} \end{array}$

Write brief answer to the following questions. | Q II. 19. (iv) | Page 224

Complete the following:

$\ce{CaC2 ->[H2O]}$

Write brief answer to the following questions. | Q II. 20. | Page 224

How will distinguish 1 – butyne and 2 – butyne?

## Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 13 - Hydrocarbons

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Concepts covered in Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 13 Hydrocarbons are Alkenes, Alkynes, Aromatic Hydrocarbons, Introduction and Classification of Alkanes, Alkanes.

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