Class 11 Chemistry Chapter 12 Organic Chemistry – Some Basic Principles and Techniques MCQs

Class 11 chemistry MCQs with answers are provided here for chapter 12 Organic Chemistry – Some Basic Principles and Techniques. These MCQs are based on CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. By practicing these Class 11 Multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 11 Annual examinations as well as other entrance exams such as NEET and JEE.

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Class 11 Organic Chemistry – Some Basic Principles and Techniques MCQs

1. The IUPAC name of CH₃CHO is:

(a) Acetaldehyde

(b) Methylaldehyde

(c) Formyl chloride

(d) Ethanal

Ans: (a)

Solution: The IUPAC name of CH₃CHO is Acetaldehyde

2. The structure of 4-Methylpent-2-en-1-ol is:

(a) CH₃CH₂CH=CHCH₂OH

(b) (CH₃)₂C=CHCH₂CH₂OH

(c) (CH₃)₂CHCH=CHCH₂OH

(d) CH₃CH(OH)CH-CH=C(CH₃)₂

Ans: (c)

Solution: The structure of 4-Methylpent-2-en-1-ol is (CH₃)₂CHCH=CHCH₂OH

3. Which of the following molecular formulae belongs to the alkyne series?

(a) C₇H₁₄

(b) C₁₀H₂₂

(c) C₉H₁₆

(d) C₁₆H₃₂

Ans: (c)

Solution: The general formulae of the alkyne series is C_nH_2n-2 . The correct molecular formula of alkyne is C₉H₁₆

4. The addition of carbonyl compound to HCN is an example of

(a) Nucleophilic substitution

(b) Electrophilic addition

(c) Nucleophilic addition

(d) Electrophilic substitution

Ans: (c)

Solution: The addition of carbonyl compounds to HCN is an example of nucleophilic addition. Here CN^– act as nucleophile

5. Nucleophilicity order is correctly represented by

(a) CH₃^– < NH₂^– < HO^– < F^–

(b) CH₃^– > NH₂^– > HO^– > F^–

(c) NH₂^– > F^– > HO^– > CH₃^–

(d) CH₃^– ≃ NH₂^– > HO^– ≃ F^–

Ans: (b)

Solution: Nucleophilicity order is correctly represented by CH₃^– > NH₂^– > HO^– > F^–

6. Hyperconjugation is most useful for stabilizing which of the following carbocation?

(a) Neopentyl

(b) Tert-butyl

(c) Iso-propyl

(d) Ethyl

Ans: (b)

Solution:Hyperconjugation is useful for stabilizing tertiary butyl carbocation with nine hydrogen atom at the alpha positions

7. During Lassaigne’s test set of Sulphur and nitrogen present in an organic compound change into:

(a) Na₂S and NaCN

(b) Na₂SO₄ and NaCN

(c) Na₂S and NaCNO

(d) NaCN and NaCNO

Ans: (a)

Solution: During Lassaigne’s test Sulphur and nitrogen compounds change into Na₂S and NaCN.

8. A miscible mixture of benzene and chloroform can be separated by:

(a) Sublimation

(b) distillation

(c) filtration

(d) crystallisation

Ans: (b)

Solution: A miscible mixture of benzene and chloroform can be separated by distillation process due to different boiling points.

9. Molecular mass of volatile substance is determined by

(a) Kjeldahl’s method

(b) Duma’s method

(c) Victor Mayer’s method

(d) Liebig’s method

Ans: (c)

Solution: Victor Mayer’s method is useful for volatile substances.

10. The most satisfactory method to separate mixture of sugar is:

(a) Fractional crystallization

(b) Sublimation

(c) Chromatography

(d) None of these

Ans: (c)

Solution: Chromatography is the most satisfactory method to separate a mixture of sugar.

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