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

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Questions
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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