Class 11 Organic Chemistry 2 Marks important questions

Class 11 Organic Chemistry 2 Marks important questions

ORGANIC CHEMISTRY for IPE MARCH 2025

IUPAC Names :

2.Draw the Conformations of Ethane ?

Ethane has two Conformations
1.Eclipsed and
2.Staggered Conformation.
Both can be represented in Sawhorse and Newmann projection formula

1. SAWHORSE PROJECTION
   
2. Newmann Projection

Class 11 Organic Chemistry-PDF

Class 11 Organic Chemistry multiple choice questions For EAPCET
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What is the IUPAC name of CH₃CHO?

• (a) Acetaldehyde
• (b) Methylaldehyde
• (c) Formyl chloride
• (d) Ethanal
  Answer: (a) Acetaldehyde

Which of the following behaves both as a nucleophile and as an electrophile?

• (a) CH₃C≡N
• (b) CH₃OH
• (c) CH₂=CHCH₃
• (d) CH₃NH₂
  Answer: (a) CH₃C≡N

Which of the following cannot be represented by resonance structures?

• (a) Dimethyl ether
• (b) Nitrate anion
• (c) Carboxylate anion
• (d) Toluene
  Answer: (a) Dimethyl ether

What is the hybridization of CH₃CH₂CH₂CN?

• (a) sp, sp³
• (b) sp², sp³
• (c) sp
• (d) sp, sp²
  Answer: sp³ for CH₃CH₂CH₂ and sp for CN.

Which one is the strongest acid among the following options?

• (a) CH₂FCOOH
• (b) CH₂ClCOOH
• (c) CHCl₂COOH
• (d) CHF₂COOH
  Answer: (d) CHF₂COOH

The displacement of electrons in a multiple bond in the presence of an attacking reagent is called:

• (a) Inductive effect
• (b) Electromeric effect
• (c) Resonance
• (d) Hyperconjugation
  Answer: (b) Electromeric effect

During Lassaigne’s test, sulfur and nitrogen present in an organic compound change into:

• (a) Na₂S and NaCN
• (b) Na₂SO₄ and NaCN
• (c) Na₂S and NaCNO
• (d) NaCN and NaCNO
  Answer: (a) Na₂S and NaCN

How many σ and π bonds are present in the molecule N≡C-CH-C≡N?

• (a) σ = 5; π = 4
• (b) σ = 6; π = 3
• (c) σ = 4; π = 2
• (d) σ = 3; π = 5
  Answer: σ = 5; π = 4

Which one is the correct order of acidity?

• (a) CH₂=CH₂ > CH=CH₂ > CH₃C≡CH > CH≡C
• (b) CH≡CH > CH₃C≡CH > CH₂=CH₂ > CH₃−CH₃
• (c) CH≡CH > CH₂=CH₂ > CH₃C≡CH > CH₃−CH₃
• (d) CH₃−CH₃ > CH₂=CH₂ > CH₃−C≡CH > CH≡CH
  Answer: (b) CH≡CH > CH₃C≡CH > CH₂=CH₂ > CH₃−CH₃

σ bonds are stronger than π bonds.

• (a) True
• (b) False
  Answer: True

1. What is the IUPAC name of CH₃COCH₃?
   • (a) Propan-2-one
   • (b) Butan-2-one
   • (c) Ethanol
   • (d) Acetone
     Answer: (d) Acetone
2. Which of the following is an example of an alkene?
   • (a) C₂H₆
   • (b) C₃H₆
   • (c) C₄H₁₀
   • (d) C₅H₁₂
     Answer: (b) C₃H₆
3. What is the functional group of alcohols?
   • (a) –OH
   • (b) –COOH
   • (c) –CHO
   • (d) –NH₂
     Answer: (a) –OH
4. Which compound is a ketone?
   • (a) CH₃CHO
   • (b) CH₃COCH₂CH₃
   • (c) CH₃CH₂OH
   • (d) CH₃C≡CH
     Answer: (b) CH₃COCH₂CH₃
5. Which of the following has a triple bond?
   • (a) Ethylene
   • (b) Acetylene
   • (c) Propylene
   • (d) Butane
     Answer: (b) Acetylene
6. What is the IUPAC name of C₂H₅Br?
   • (a) Bromoethane
   • (b) Ethyl bromide
   • (c) Bromobutane
   • (d) Propyl bromide
     Answer: (a) Bromoethane
7. Which of the following compounds is aromatic?
   • (a) Cyclohexane
   • (b) Benzene
   • (c) Cyclopentene
   • (d) Butadiene
     Answer: (b) Benzene
8. What type of reaction occurs when an alkene reacts with H₂ in the presence of a catalyst?
   • (a) Addition reaction
   • (b) Elimination reaction
   • (c) Substitution reaction
   • (d) Rearrangement reaction
     Answer: (a) Addition reaction
9. Which of the following statements about alkanes is true?
   • (a) They are unsaturated hydrocarbons.
   • (b) They contain at least one double bond.
   • (c) They are saturated hydrocarbons.
   • (d) They have higher reactivity than alkenes.
     Answer: (c) They are saturated hydrocarbons.
10. What is the main product when ethene reacts with bromine water?
    • (a) Ethanol
    • (b) 1,2-Dibromoethane
    • (c) Ethyl bromide
    • (d) Bromobenzene
      Answer: (b) 1,2-Dibromoethane
11. Which of the following compounds is a primary alcohol?
    • (a) CH₃CH₂OH
    • (b) CH₃CHOHCH₃
    • (c) CH₃C(=O)(OH)
    • (d) CH₃C(CH₃)(OH)(C₂H₅)
      Answer: (a) CH₃CH₂OH
12. What type of isomerism is shown by butanol and isobutanol?
    • (a) Structural isomerism
    • (b) Geometric isomerism
    • (c) Optical isomerism
    • (d) Functional group isomerism
      Answer: (a) Structural isomerism
13. Which reagent can be used to convert an alkene to an alcohol?
    • (a) H₂O in presence of acid
    • (b) HBr
    • (c) NaBH₄
    • (d) KMnO₄
      Answer: (a) H₂O in presence of acid
14. Which compound has a carbonyl group?
    • (a) Ether
    • (b) Aldehyde
    • (c) Alkane
    • (d) Alkene
      Answer: (b) Aldehyde
15. What type of bond exists between carbon atoms in alkenes?
    • (a) Single bond only
    • (b) Double bond only
    • (c) Triple bond only
    • (d) Both single and double bonds
      Answer:  (b): Double bond only
16. Which one is a characteristic reaction of aldehydes?
    – (a): Reduction to alcohols
    – (b): Oxidation to carboxylic acids
    – (c): Nucleophilic addition
    – (d): All of the above
    Answer:  (d): All of the above
17. The process of converting an alkene into an alkane by adding hydrogen is called:
    – (a): Hydrogenation
    – (b): Halogenation
    – (c): Hydrolysis
    – (d): Dehydrogenation
    Answer:  (a): Hydrogenation
18. Which compound contains a carboxylic acid functional group?
    – (a): CH₄
    – (b): CH₃COOH
    – (c): C₂H₂
    – (d): C₂H₅OH
    Answer:  (b): CH₃COOH
19. What type of reaction occurs when an alcohol reacts with a carboxylic acid to form an ester?
    – (a): Condensation reaction
    – (b): Hydrolysis
    – (c): Substitution reaction
    – (d): Addition reaction
    Answer:  (a): Condensation reaction
20. Which of the following compounds has a higher boiling point due to hydrogen bonding?
    – (a): Ethane
    – (b): Ethanol
    – (c): Propene
    – (d): Butane
    Answer:  (b): Ethanol
21. Which reagent can oxidize primary alcohols to aldehydes?
    – (a): KMnO4
    – (b): H2SO4
    – (c): NaBH4
    – (d): LiAlH4
    Answer:  (a): KMnO4
22. The simplest alkyne is:
    – (a): Ethyne
    – (b): Propyne
    – (c): Butyne
    – (d): Methyne
    Answer:  (a): Ethyne
23. Which compound can undergo hydrolysis to form an alcohol and a carboxylic acid?
    -(a): Ester
    -(b): Ether
    -(c): Alkane
    -(d): Alkyne
    Answer:(a): Ester
24. The molecular formula for benzene is:
    -(a): C6H6
    -(b): C5H5
    -(c): C7H8
    -(d): C8H10
    Answer:(a): C6H6
25. Which of the following reactions involves the formation of a cyclic compound from an alkene?
    -(a): Polymerization
    -(b): Diels-Alder reaction
    -(c): Hydrogenation
    -(d): Halogenation
    Answer:(b): Diels-Alder reaction
26. In which type of organic compound would you find a phenolic hydroxyl group (-OH)?
    -(a): Alcohols
    -(b): Phenols
    -(c): Ethers
    -(d): Aldehydes
    Answer:(b): Phenols
27. What type of hybridization occurs in carbon atoms involved in a triple bond?
    -(a): sp² hybridization
    -(b): sp³ hybridization
    -(c): sp hybridization
    -(d): None of the above
    Answer:(c): sp hybridization
28. When propanoyl chloride reacts with water, what product is formed?
    -(a): Propanoic acid and hydrochloric acid
    -(b): Propanol and hydrochloric acid
    -(c):: Propanamide and hydrochloric acid
    -(d):: Propanoate and hydrogen chloride
    Answer:(a):: Propanoic acid and hydrochloric acid
29. Which functional group contains nitrogen as part of its structure?
    -(a):: Alcohols
    -(b):: Ethers
    -(c):: Amines
    -(d):: Aldehydes
    ** Answer: *(c):: Amines

30. Which compound can be formed by the dehydration of an alcohol?**
(a) Alkane
(b) Ether
(c) Alkene
(d) Aldehyde
Answer: (c) Alkene

Class 11 Organic Chemistry-Handwritten Notes

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