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 12 - Basic concept of organic reactions [Latest edition]

## Chapter 12: Basic concept of organic reactions

Choose the best answer [Pages 175 - 176]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 12 Basic concept of organic reactionsChoose the best answer [Pages 175 - 176]

Choose the best answer | Q I. 1. | Page 175

For the following reactions

1. $\ce{CH3CH2CH2Br + KOH → CH3 – CH = CH2 + KBr + H2O}$
2. $\ce{(CH3)3CBr + KOH → (CH3)3COH + KBr}$

Which of the following statement is correct?

• (A) is elimination, (B) and (C) are substitution

• (A) is substitution, (B) and (C) are elimination

• (A) and (B) are elimination and (C) is addition reaction

• (A) is elimination, B is substitution and (C) is addition reaction.

Choose the best answer | Q I. 2. | Page 175

What is the hybridisation state of benzyl carbonium ion?

• sp2

• spd2

• sp3

• sp2d

Choose the best answer | Q I. 3. | Page 175

Decreasing order of nucleophilicity is ______.

• OH > NH2 > -OCH3 > RNH2

• NH2 > OH > -OCH3 > RNH2

• NH2 > CH3O > OH > RNH2

• CH3O > NH2 > OH > RNH2

Choose the best answer | Q I. 4. | Page 175

Which of the following species is not electrophilic in nature?

• Cl+

• BH3

• H3O+

• +NO2

Choose the best answer | Q I. 5. | Page 175

Homolytic fission of covalent bond leads to the formation of ______.

• electrophile

• nucleophile

• Carbo cation

Choose the best answer | Q I. 6. | Page 175

Hyper Conjugation is also known as

• no bond resonance

• Baker – nathan effect

• both no bond resonance and Baker – nathan effect

• none of these

Choose the best answer | Q I. 7. | Page 175

Which of the group has highest + I effect?

• CH3

• CH3 – CH2 –

• (CH3)2 – CH-

• (CH3)3 – C –

Choose the best answer | Q I. 8. | Page 175

Which of the following species does not exert a resonance effect?

• C6H5OH

• C6H5Cl

• C6H5NH2

• C6H5NH3

Choose the best answer | Q I. 9. | Page 175

- I effect is shown by ______.

• – Cl

•  – Br

• both – Cl and – Br

•  – CH3

Choose the best answer | Q I. 10. | Page 175

Which of the following carbocation will be most stable?

• Ph3+C –

• CH3 – +CH2 –

• (CH3)2 – +CH

• CH2 = CH – +CH2

Choose the best answer | Q I. 11. | Page 175

Assertion: Tertiary Carbocations are generally formed more easily than primary Carbocations ions.

Reason: Hyper conjucation as well as inductive effect due to additional alkyl group stabilize tertiary carbonium ions.

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

• both assertion and reason are true but reason is not the correct explanation of assertion.

• assertion is true but reason is false.

• both assertion and reason are false.

Choose the best answer | Q I. 12. | Page 176

Heterolytic fission of C–C bond results in the formation of ______.

• Carbanion

• Carbocation

• Carbanion and Carbocation

Choose the best answer | Q I. 13. | Page 176

Which of the following represent a set of nucleophiles?

• BF3, H2O, NH2-

• AlCl3, BF3, NH3

• CN, RCH2, ROH

• H+, RNH3+, :CCl2

Choose the best answer | Q I. 14. | Page 176

Which of the following species does not acts as a nucleophile?

• ROH

• ROR

• PCl3

• BF3

Choose the best answer | Q I. 15. | Page 176

The geometrical shape of carbocation is ______.

• Linear

• tetrahedral

• Planar

• Pyramidal

Write brief answer to the following questions. [Page 176]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 12 Basic concept of organic reactionsWrite brief answer to the following questions. [Page 176]

Write brief answer to the following questions. | Q II. 1. (a) | Page 176

Write a short note on resonance.

Write brief answer to the following questions. | Q II. 1. (b) | Page 176

Write a short note on hyperconjucation.

Write brief answer to the following questions. | Q II. 2. | Page 176

What is electrophiles? Give a suitable example.

Write brief answer to the following questions. | Q II. 2. | Page 176

What is nucleophiles? Give a suitable example.

Write brief answer to the following questions. | Q II. 3. (i) | Page 176

Show the heterolysis of a covalent bond by using curved arrow notation and complete the following equation. Identify the nucelophile.

CH3 – Br + KOH →

Write brief answer to the following questions. | Q II. 3. (ii) | Page 176

Show the heterolysis of a covalent bond by using curved arrow notation and complete the following equation. Identify the nucelophile.

$\ce{CH3 – O – CH3 + HI →}$

Write brief answer to the following questions. | Q II. 4. | Page 176

Explain inductive effect with suitable example.

Write brief answer to the following questions. | Q II. 5. | Page 176

Explain the electromeric effect.

Write brief answer to the following questions. | Q II. 6. (i) | Page 176

Give example for the following type of organic reaction.

β - elimination

Write brief answer to the following questions. | Q II. 6. (ii) | Page 176

Give example for the following type of organic reaction.

Electrophilic substitution

## Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 12 - Basic concept of organic reactions

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Concepts covered in Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 12 Basic concept of organic reactions are Basic Concept of Organic Reactions, Different Types of Organic Reactions.

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