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NCERT Solutions for class 11 Chemistry | Chapter 12 Organic Chemistry Some Basic Principles And Techniques

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Class 11 Chemistry Chapter 12 Organic Chemistry Some Basic Principles And Techniques Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern./p>

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(1) Assertion (A) : Simple distillation can help in separating a mixture of propan-1-ol (boiling point 97°C) and propanone (boiling point 56°C).

Reason (R) : Liquids with a difference of more than 20°C in their boiling points can be separated by simple distillation.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: Both A and R are correct and R is the correct explanation of A.
(2) Assertion (A) : Energy of resonance hybrid is equal to the average of energies of all canonical forms.

Reason (R) : Resonance hybrid cannot be presented by a single structure.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: A is not correct but R is correct.

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(3) Assertion (A) : Pent- 1- ene and pent- 2- ene are position isomers.

Reason (R) : Position isomers differ in the position of functional group or a substituent.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: Both A and R are correct and R is the correct explanation of A.
(4) Assertion (A) : All the carbon atoms in H2C = C = CH2 are sp2 hybridised

Reason (R) : In this molecule all the carbon atoms are attached to each other by double bonds.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: A is not correct but R is correct.
(5) Assertion (A) : Sulphur present in an organic compound can be estimated quantitatively by Carius method.

Reason (R) : Sulphur is separated easily from other atoms in the molecule and gets precipitated as light yellow solid.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: Both A and R are not correct.
(6) Assertion (A): Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.

Reason (R) : The coloured components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.

[A] Both A and R are correct and R is the correct explanation of A.
[B] Both A and R are correct but R is not the correct explanation of A.
[C] Both A and R are not correct.
[D] A is not correct but R is correct.
Answer: Steam distillation
(7) A nucleophile is a species that should have
[A] a pair of electrons to donate
[B] positive charge
[C] negative charge
[D] electron-deficient species
Answer: A, C
(8) Which of the following method is used for estimation of nitrogen?
[A] Leibig’s method
[B] Lassaigne’s method
[C] Kjeldahl’s method
[D] Carius method
Answer: Kjeldahl’s method
(9) The salt obtained by melting sodium metal with nitrogen containing carbon compound:
[A] NaNO2
[B] NaNO3
[C] NaCN
[D] NaNH2
Answer: NaCN
(10) IUPAC name of iso-butane is :
[A] 2-methyl butane
[B] 2-methyl propane
[C] 2-ethyl butane
[D] 2-butyne
Answer: 2-methyl propane
(11) Prefix used for —COOH functional group is :
[A] Carbomayl
[B] Carbonyl
[C] Carboxy
[D] Alkoxycarbonyl
Answer: Carboxy
(12) Which of the following substituent do not show +I effect ?
[A] Br
[B] R—OH
[C] FeCl3
[D] —CHR2
Answer: Br
(13) Which of the following reagent is nucleophilic ?
[A] Br
[B] R—OH
[C] FeCl3
[D] CO2
Answer: R—OH
(14) Which of the following is most stable carbocation ?
[A] +CH3
[B] +CH2CH3
[C]
[D] (CH3)3C+
Answer: (CH3)3C+
(15) Homolytic fission results in formation of:
[A] Carbocation
[B] Carbene
[C] Nitrene
[D] Free radical
Answer: Free radical
(16) Which of the following group do not give addition reactions ?
[A] C ≡ C
[B] C = C
[C] C = O
[D] CH3 — CH3
Answer: CH3 — CH3
(17) Why do we boil the extract with conc. HNO3 in Lassaigne’s test for halogens?
[A] to increase the concentration of NO3– ions
[B] to increase the solubility product of AgCl
[C] it increases the precipitation of AgCl
[D] for the decomposition of Na2S and NaCN formed
Answer: for the decomposition of Na2S and NaCN formed
(18) How many structural isomers are possible if one hydrogen in diphenylmethane is replaced by chlorine?
[A] 8
[B] 4
[C] 7
[D] 6
Answer: 4
(19) Which of the following methods is best suited for the separation of a mixture containing naphthalene and benzoic acid
[A] Crystallisation
[B] Chromatography
[C] Sublimation
[D] Distillation
Answer: Sublimation
(20) Find the compound which undergoes nucleophilic substitution reaction exclusively by an SN1 mechanism
[A] Benzyl chloride
[B] Chlorobenzene
[C] Ethyl chloride
[D] Isopropyl chloride
Answer: Benzyl chloride

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