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

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Questions
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 Organic Chemistry
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

Organic Chemistry

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.

Organic Chemistry

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 Organic Chemistry
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?

organic Chemistry

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

Organic Chemistry

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

Organic Chemistry

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’?

Organic Chemistry

A Organic Chemistry
B Organic Chemistry
C Organic Chemistry
D Organic Chemistry

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

Organic Chemistry

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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