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Objective Type Questions On Class 11 Chemistry Chapter 12 Organic Chemistry Some Basic Principles And Techniques

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Free download in PDF 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) Which of the following is the correct IUPAC name?
[A] 3-Ethyl-4, 4-dimethylheptane
[B] 4,4-Dimethyl-3-ethylheptane
[C] 5-Ethyl-4, 4-dimethylheptane
[D] 4,4-Bis(methyl)-3-ethylheptane
Answer: 4,4-Dimethyl-3-ethylheptane
(2) The IUPAC name for
[A] 1-hydroxypentane-1,4-dione
[B] 1,4-dioxopentanol
[C] 1-carboxybutan-3-one
[D] 4-oxopentanoic acid
Answer: 4-oxopentanoic acid

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(3) The IUPAC name for

[A] 1-Chloro-2-nitro-4-methylbenzene
[B] 1-Chloro-4-methyl-2-nitrobenzene
[C] 2-Chloro-1-nitro-5-methylbenzene
[D] m-Nitro-p-chlorotoluene
Answer: 1-Chloro-4-methyl-2-nitrobenzene
(4) Electronegativity of carbon atoms depends upon their state of hybridisation. In which of the following compounds, the carbon marked with asterisk is most electronegative?
[A] CH3 – CH2 – *CH2 –CH3
[B] CH3 – *CH = CH – CH3
[C] CH3 – CH2 – C ≡ *CH
[D] CH3 – CH2 – CH = *CH2
Answer: CH3 – CH2 – C ≡ *CH
(5) In which of the following, functional group isomerism is not possible?
[A] Alcohols
[B] Aldehydes
[C] Alkyl halides
[D] Cyanides
Answer: Alkyl halides
(6) The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is:
[A] Distillation
[B] Crystallisation
[C] Distillation under reduced pressure
[D] Steam distillation
Answer: Steam distillation
(7) During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?
[A] Column chromatography
[B] Solvent extraction
[C] Distillation
[D] Thin layer chromatography
Answer: Thin layer chromatography
(8) The principle involved in paper chromatography is
[A] Adsorption
[B] Partition
[C] Solubility
[D] Volatility
Answer: Partition
(9) What is the correct order of decreasing stability of the following cations.

[A] II > I > III
[B] II > III > I
[C] III > I > II
[D] I > II > III
Answer: II > I > III
(10) Correct IUPAC name for
[A] 2- ethyl-3-methylpentane
[B] 3,4- dimethylhexane
[C] 2-sec-butylbutane
[D] 2, 3-dimethylbutane
Answer: 3,4- dimethylhexane
(11) In which of the following compounds the carbon marked with asterisk is expected to have greatest positive charge?
[A] *CH3—CH2—Cl
[B] *CH3—CH2—Mg+Cl–
[C] *CH3—CH2—Br
[D] *CH3—CH2—CH3
Answer: *CH3—CH2—Cl
(12) Ionic species are stabilised by the dispersal of charge. Which of the following carboxylate ion is the most stable?

[A] (i)
[B] (ii)
[C] (iii)
[D] (iv)
Answer: (iv)
(13) Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. Name the type of intermediate formed in the first step of the following addition reaction.

H3C—HC = CH2 + H+ →?

[A] 2° Carbanion
[B] 1° Carbocation
[C] 2° Carbocation
[D] 1° Carbanion
Answer: 2° Carbocation
(14) Covalent bond can undergo fission in two different ways. The correct representation involving a heterolytic fission of CH3—Br is

[A] (i)
[B] (ii)
[C] (iii)
[D] (iv)
Answer: (ii)
(15) The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H+ ion to portion which can be shown as

[A] (i)
[B] (ii)
[C] (iii)
[D] (iv)
Answer: (ii)
(16) Which of the following compounds contain all the carbon atoms in the same hybridisation state?
[A] H—C ≡ C—C ≡ C—H
[B] CH3—C ≡ C—CH3
[C] CH2 = C = CH2
[D] CH2 = CH—CH = CH2
Answer: A, D
(17) In which of the following representations given below spatial arrangement of group/ atom different from that given in structure ‘A’?

[A]
[B]
[C]
[D]
Answer: A, C, D
(18) Electrophiles are electron seeking species. Which of the following groups contain only electrophiles?

[A] (i)
[B] (ii)
[C] (iii)
[D] (iv)
Answer: B, C
(19) 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
(20) Hyperconjugation involves delocalisation of ___________.
[A] electrons of carbon-hydrogen σ bond of an alkyl group directly attached to an atom of unsaturated system.
[B] electrons of carbon-hydrogen σ bond of alkyl group directly attached to the positively charged carbon atom.
[C] π-electrons of carbon-carbon bond
[D] lone pair of electrons
Answer: A, B

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