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Organic Chemistry: Some Basic Principles and Techniques Class 11 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
I.U.P.A.C. name of 4-isopropyl-m-xylene is
(a) l-Isopropyl-2, 4-Dimethyl benzene
(b) 4-Iso propyl-m-Xylene
(c) l-Isopropyl-3, 5-Dimethyl benzene
(d) 4-Isopropyl-3, 5-Dimethyl benzene.
Answer
Answer: (a) l-Isopropyl-2, 4-Dimethyl benzene
Question 2.
Among the following alkenes : 1-butane (I), cis-2-butene (II), trans-2-butene (III), the decreasing order of stability is
(a) III > II > I
(b) III > I > II.
(c) I > II > III
(d) II > I > III
Answer
Answer: (a) III > II > I
Question 3.
The reaction
is
(a) Elimination reaction
(b) Substitution reaction
(c) Free radical reaction
(b) Addition reaction
Answer
Answer: (b) Substitution reaction
Question 4.
The I.U.P.A.C. name of
(a) 3-Methyl cyclohexene
(b) 1-methyl cylohex-2-ene.
(c) 6-methyl cyclohexene
(d) 1-methyl cyclohex5-ene.
Answer
Answer: (a) 3-Methyl cyclohexene
Question 5.
The I.U.P.A.C. name of CH3COCH(CH3)2 is
(a) 3-methyl-2-butanone
(b) Isopropyl methyl ketone
(c) 2-methyl-3-butanone
(d) 4-methyl isopropyl ketone
Answer
Answer: (a) 3-methyl-2-butanone
Question 6.
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
Answer
Answer: (a) Toluene
Question 7.
The general formula CnH2nO23 could be for open chain
(a) Dialdehydes
(b) Diketones
(c) Carboxylic acid
(d) Diols
Answer
Answer: (c) Carboxylic acid
Question 8.
Name of the compound given below is
(a) 4-ethyl-3-methyloctane
(b) 3 -methyl-4-ethyloctane
(c) 2, 3-diethylheptane
(d) 5 – ethyl-6 -methyloctane.
Answer
Answer: (a) 4-ethyl-3-methyloctane
Question 9.
The C-H bond distance is longest in
(a) C2H2
(b) C2H4
(c) C2H6
(d) C2H2Br2
Answer
Answer: (c) C2H6
Question 10.
Which of the following represents the given mode of hybridisation sp²-sp²-sp-sp from left to right?
(a) CH2 = CH-C ≡ N
(b) HC ≡ C – C = CH
(c) H2C = C = C = CH2
Answer
Answer: (a) CH2 = CH-C ≡ N
Question 11.
What is the decreasing order of stability of the ions?
(I) CH3-CH-CH3
(II) CH3-CH-OCH3
(III) CH3-CH-CO-CH3
(a) I > II > III
(b) II > III > I
(c) III > I > II
(d) II > I > III
Answer
Answer: (d) II > I > III
Question 12.
Which of the following is an electrophile?
(a) H2O
(b) NH3
(c) AlCl3
(d) C2H5NH2
Answer
Answer: (c) AlCl3
Question 13.
The most stable carbanion among the following is
Answer
Answer: (d)
Question 14.
(a) resonating structure
(b) Tautomers
(c) Geometrical isomers
(d) Optical isomers.
Answer
Answer: (a) resonating structure
Question 15.
The arrangement of (CH3)3C -, (CH3)2CH-, CH3 CH2– when attached to benzene or unsaturated group in increasing order of inductive effect is
(a) (CH3)3C- < (CH3)2CH- < CH3 – CH2–
(b) CH3 -CH2– < (CH3)2CH- < (CH3)3C-
(c) (CH3)2CH-< (CH3)3C- < CH3-CH2–
(d) (CH3)3C- < CH3– CH2– < (CH3)2CH
Answer
Answer: (a) (CH3)3C- < (CH3)2CH- < CH3 – CH2–
Question 16.
The I.U.P.A.C. name of the following compound is
(a) 3-Ethyl-2-hexene
(b) 3-Propyl-2-bexene
(c) 3-Propyl-3-hexene
(d) 4-Ethyl-4-hexene
Answer
Answer: (a) 3-Ethyl-2-hexene
Question 17.
The number and type of bonds between two carbon atoms in CaC2 are
(a) One sigma (σ) and one pi (π) bonds
(b) One sigma (σ) and two pi (π) bonds
(c) One sigma (σ) and one and half pi (π) bonds
(d) One sigma (σ) bond
Answer
Answer: (b) One sigma (σ) and two pi (π) bonds
Question 18.
The I.U.P.A.C name of the compond is
(a) 3, 3, 3- Trimethylpropene
(b) 1,1, 1-Trimethyl-2-pentane
(c) 3, 3-Dimethyl-l-butene
(d) 2, 2-Dimethyl-3-butane.
Answer
Answer: (c) 3, 3-Dimethyl-l-butene
Question 19.
Which of the following is correct regarding the-I. Effect of substituents?
(a) -NR2 < -OR < F-
(b) -NR2 > -OR < -F
(c) -NR2 < -OR < -F
(d) -NR2 > -OR > -F
Answer
Answer: (a) -NR2 < -OR < F-
Question 20.
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.
Answer
Answer: (b) Ethyl but-2-enoate
Question 21.
The I.U.P.A.C. name of
(a) Acetyl cyclohexa diene
(b) l-Cyclohexa-2, 4 dienyl ethanone
(c) 6-Cyclohexa-1, 3 dienyl ethanone
(d) none of these
Answer
Answer: (b) l-Cyclohexa-2, 4 dienyl ethanone
Question 22.
CH3CH2Cl undergoes homolytic fission to produce
(a) CH3CH2 & Cl
(b) CH3CH\(_{2}^{+}\) & Cl–
(c) CH3CH\(_{2}^{+}\) & Cl
(d) CH3CH2 & Cl–
Answer
Answer: (a) CH3CH2 & Cl
Fill in the blanks
Question 1.
A carbon atom having four different groups is known as ………………..
Answer
Answer: asymmetric carbon atom
Question 2.
Electrophilic reagents are ……………….. & ……………….. deficient species.
Answer
Answer: Electron, Electron
Question 3.
Carbocation is formed by a group of carbon & other atoms having only ……………….. electrons.
Answer
Answer: six
Question 4.
Free radicals are formed due to ……………….. bond fission.
Answer
Answer: homolytic
Question 5.
Mesomeric effect is observed only in the molecules having ………………..
Answer
Answer: conjugated system
Question 6.
Thermally unstable liquids are purified by ………………..
Answer
Answer: distillation under reduced pressure
Question 7.
Sodium extract is boiled with HNO3 to destroy ……………….. before testing for the presence of Chlorine.
Answer
Answer: CN & / or S2-
Question 8.
In carius method, the sulphur present in the organic compound is converted into ………………..
Answer
Answer: SO\(_{4}^{2-}\)
Question 9.
The Prussian blue colour obtained during lassaigne’s test for nitrogen is due to the formation of ………………..
Answer
Answer: ferric ferrocyanide
Question 10.
The ……………….. can be used for separating the constituents of solid mixture only when they differ in their solubilities in a solvent.
Answer
Answer: fractional crystallization
Write True / False
Question 1.
2, 2 -Dimethylbutane and 2-methylbutane are chain isomers of hexane.
Answer
Answer: False
Question 2.
Acetylene is a tetrahedral molecule.
Answer
Answer: False
Question 3.
In benzene, carbon uses all the three p orbitals for hybridisation.
Answer
Answer: False
Question 4.
The members of a homologous series can be represented by a general formula.
Answer
Answer: True
Question 5.
Propanoic acid and methyl ehtanoate are isomers.
Answer
Answer: True
Question 6.
Inductive effect involves displacement of electrons.
Answer
Answer: True
Question 7.
Electromeric effect is a permanent effect.
Answer
Answer: False
Question 8.
Simple carbonions are isoelectronic and isostructural with ammonia.
Answer
Answer: True
Question 9.
Free radicals are obtained as a result of heterolytical fission of covalent bonds.
Answer
Answer: False
Question 10.
Carbocations are planar species.
Answer
Answer: True
Match the Following
Answer
Answer:
1. – (b)
2. – (a)
3. – (e)
4. – (c)
5. – (d)
6. – (g)
7. – (f)
8. – (h)
9. – (j)
1o. – (i)
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