JEE Advanced (Single Correct Type): Some Basic Principles of Organic Chemistry | Chapter-wise Tests for JEE Main & Advanced PDF Download

Q.1. The IUPAC name of CH₃CHO is:
(a) Acetaldehyde
(b) Methylaldehyde
(c) Formyl chloride
(d) Ethanal

Correct Answer is option (a)
The IUPAC name of CH₃CHO is Acetaldehyde

Q.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

Correct Answer is option (c)
The structure of 4-Methylpent-2-en-1-ol is (CH₃)₂CHCH=CHCH₂OH

Q.3. Which of the following molecular formulae belongs to the alkyne series?
(a) C₇H₁₄
(b) C₁₀H₂₂
(c) C₉H₁₆
(d) C₁₆H₃₂

Correct Answer is option (c)
The general formulae of the alkyne series is C_nH_2n-2 . The correct molecular formula of alkyne is C₉H₁₆

Q.4. The addition of carbonyl compound to HCN is an example of
(a) Nucleophilic substitution
(b) Electrophilic addition
(c) Nucleophilic addition
(d) Electrophilic substitution

Correct Answer is option (c)
The addition of carbonyl compounds to HCN is an example of nucleophilic addition. Here CN^– act as nucleophile

Q.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^–

Correct Answer is option (b)
Nucleophilicity order is correctly represented by CH₃^– > NH₂^– > HO^– > F^–

Q.6. Hyperconjugation is most useful for stabilizing which of the following carbocation?
(a) Neopentyl
(b) Tert-butyl
(c) Iso-propyl
(d) Ethyl

Correct Answer is option (b)
Hyperconjugation is useful for stabilizing tertiary butyl carbocation with nine hydrogen atom at the alpha positions

Q.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

Correct Answer is option (a)
During Lassaigne’s test Sulphur and nitrogen compounds change into Na₂S and NaCN.

Q.8. A miscible mixture of benzene and chloroform can be separated by:
(a) Sublimation
(b) Distillation
(c) Filtration
(d) Crystallisation

Correct Answer is option (b)
A miscible mixture of benzene and chloroform can be separated by distillation process due to different boiling points.

Q.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

Correct Answer is option (c)
Victor Mayer’s method is useful for volatile substances.

Q.10. The most satisfactory method to separate mixture of sugar is:
(a) Fractional crystallization
(b) Sublimation
(c) Chromatography
(d) None of these

Correct Answer is option (c)
Chromatography is the most satisfactory method to separate a mixture of sugar.