Organic Chemistry: Some Basic Principles and Techniques MCQ Questions for Class 11 Chemistry Chapter 12 with Answers

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MCQ Questions for Class 11 Chemistry with Answers

Q1. Which element is estimated by Carius method

(A) Carbon
(B) Hydrogen
(C) Halogen
(D) Nitrogen

Q2. Identify the chiral molecule among the following:

(A) Isopropyl alcohol
(B) 2-pentanol
(C) 1-bromo 3-butene
(D) Isobutyl alcohol

(D) Isobutyl alcohol

Q3. Which of the following physical properties differ for each of a pair of enantiomers?

(A) solubility in ethanol
(B) direction of rotation of plane-polarized light
(C) boiling point and melting point
(D) index of refraction

(B) direction of rotation of plane-polarized light

Q4. Which of the following compounds possess the C-H bond with the lowest bond dissociation energy?

(A) Toluene
(B) Benzene
(C) n-Pentane
(D) 2, 2-Dimethyl propane

(A) Toluene

Q5. The compound which has one isopropyl group is

(A) 2- Methypentane
(B) 2, 2, 3- Trimethylpentane
(C) 2, 2 – Dimethylpentane
(D) 2, 2, 3, 3 – Tetramethylpentane

(A) 2- Methypentane

Q6. The displacement of electrons in a multiple bond in the presence of attacking reagent is called

(A) Inductive effect
(B) Electromeric effect
(C) Resonance
(D) Hyper conjugation.

(B) Electromeric effect

Q7. Which one of the following conformations of cyclohexane is chiral?

(A) Twist boat
(B) Rigid
(C) Chair
(D) Boat

(A) Twist boat

Q8. First organic compound to be synthesised was

(A) urea
(B) cane sugar
(C) methane
(D) acetic acid

(A) urea

Q9. Inductive effect involves

(A) displacement of σ electrons
(B) delocalization of π electrons
(C) delocalization of σ-electrons
(D) displacement of π-electrons

(A) displacement of σ electrons

Q10. 0.5 g of hydrocarbon gave 0.9 g water on combustion. The percentage of carbon in hydrocarbon is

(A) 75.8
(B) 80.0
(C) 56.6
(D) 28.6

(B) 80.0

Q11. Butanone is a four-carbon compound with the functional group –

(A) ketone
(B) carboxylic acid
(C) aldehyde.
(D) alcohol.

(A) ketone

Q12. The I.U.P.A.C. name of CH₃ – CH = CH COO C₂H₅ is

(A) Ethyl but-1 -enoate
(B) Ethyl but-2-enoate
(C) Ethyl prop-2-enoate
(D) None of these.

(B) Ethyl but-2-enoate

Q13. 59 g of an amide obtained from a carboxylic acid, RCOOH, liberated 17 g of ammonia upon heating with alkali. The acid is

(A) Formic Acid
(B) Acetic Acid
(C) Propionic Acid
(D) Benzoic Acid

(B) Acetic Acid

Q14. Which of the following cannot be represented by resonance structures?

(A) Dimethyl ether
(B) Nitrate anion
(C) Carboxylate anion
(D) Toluene

(A) Dimethyl ether

Q15. The displacement of electrons in a multiple bond in the presence of attacking reagent is called

(A) Inductive effect
(B) Electromeric effect
(C) Resonance
(D) Hyper conjugation