General Science MCQ – 103 (Chemistry)

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1. Which of the following compound is not aromatic?

2. Which of the following is not a characteristic property of arenes?
(A) Delocalization of 𝞹-electrons
(B) Resonance
(C) Greater stability
(D) Electrophilic additions

3. Which of the following statements is true for benzene?
(A) Benzene easily undergoes addition due to unsaturation
(B) 𝞹-electrons are delocalized in the benzene ring
(C) Three isomeric forms are formed on monosubstitution of benzene
(D) Two types of C-C bonds are present in benzene

4. Which of the following is the correct representation to relate the two resonating Kekule structures of benzene?
(A) →
(B) ≡
(C) ↔
(D) ⇌

5. The bond length of C-C in benzene is?
(A) 110 pm
(B) 156 pm
(C) 121 pm
(D) 139 pm

6. Which of the following is a characteristic of an aromatic compound?
(A) Cyclic
(B) Planar
(C) (4n+2)𝞹 electrons
(D) All of the above

7. Which of the following is incorrect for benzene?
(A) Planar C6 rings
(B) Localised 𝞹 bonding
(C) sp2 hybridized C atoms
(D) It shows reactions characteristics of C=C double bonds

8. Which of the following is incorrect for electrophilic substitution?
(A) –NO2 is deactivating and m-directing
(B) -Cl is activating and o, p-directing
(C) -OH is activating and o, p-directing
(D) -CH3 is activating and o, p-directing

9. The number of delocalized 𝞹 electrons in the benzene rings are?
(A) 6
(B) 8
(C) 2
(D) 4

10. Which of the following is the reactive species in the nitration of benzene?
(A) NO2+
(B) NO2-
(C) NO3
(D) HNO3

General Science MCQ – 102 (Biology)