Objective Type Questions On Class 11 Chemistry Chapter 12

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

View Answer

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

View Answer

Answer:4-oxopentanoic acid

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer:Thin layer chromatography

8 The principle involved in paper chromatography is

A Adsorption

B Partition

C Solubility

D Volatility

View Answer

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

View Answer

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

View Answer

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

View Answer

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)

View Answer

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

View Answer