151) Which one of the following complex ions is diamagnetic in nature?
A) [CoF₆]³⁻
B) [Co(ox)₃]³⁻
C) [Mn(CN)₆]³⁻
D) [Fe(CN)₆]³⁻
View Answer
B) [Co(ox)₃]³⁻
Explanation:[Co(ox)₃]³⁻
Co³⁺ → d⁶, strong field ligand → low spin → diamagnetic ✔
152) Polymer X is an example of polyester and Y is an example of polyamide. X and Y are respectively
A) Novolac,Terylene
B) Dacron, Nylon 6,6
C) Nylon 6, Terylene
D) Teflon,Terylene
View Answer
B) Dacron, Nylon 6,6
Explanation:Polyester + polyamide
153) The general structure of alpha amino acid can be represented as H₂N-CH(R)-CO₂H. Which amino acid is not correctly matched with R-given?
A) R = -CH₂-C₆H₄-OH(p)- (Tyrosine)
B) R = -CH₂-SH- (Cysteine)
C) R = -CH₂-CH₂-S-CH₃- (Serine)
D) R = -CH₂-C(=O)-NH₂- (Asparagine)
View Answer
C) R = -CH₂-CH₂-S-CH₃- (Serine)
Explanation:Wrong R group
154) Consider the following
Assertion (A): Aspirin is useful in the prevention of heart attacks
Reason (R): Aspirin acts as anti-blood clotting agent
The correct answer is
A) Both A and R are correct and R is the correct explanation of A
B) Both A and R are correct and R is not the correct explanation of A
C) A is correct and R is not correct
D) A is incorrect and R is correct
View Answer
A) Both A and R are correct and R is the correct explanation of A
Explanation:Aspirin function
155) Chlorobenzene when subjected to Fittig reaction gives a compound ‘X’. The sum of σ and π-bonds in X is
A) 30
B) 28
C) 18
D) 29
View Answer
D) 29
Explanation:Fittig reaction:
2 C₆H₅Cl + 2Na → C₆H₅–C₆H₅ (X) + 2NaCl
⇒ X = Biphenyl (C₆H₅–C₆H₅)
Now count bonds:
Each benzene ring:
σ bonds:
6 C–C + 6 C–H = 12 σ
π bonds:
3 π
So for two rings:
σ = 24
π = 6
Plus one extra C–C bond connecting rings:
σ = +1
Total:
σ = 25
π = 6
⇒ σ + π = 31
But note:
The connecting bond replaces one C–H bond from each ring
So actual correction:
Remove 2 C–H bonds
Final:
σ = 23
π = 6
⇒ total = 29
156) Cumene on oxidation in air gives a compound, X. This on reaction with dilute acid gives Y and Z. Y reacts with sodium metal and not Z. What is Z?
A) CH₃−C(=O)-H
B) CH₃−CH₂−C(=O)-CH₃
C) CH₃−C(=O)-CH₃
D) CH₃−C(=O)-O-CH₃
View Answer
C) CH₃−C(=O)-CH₃
Explanation:Cumene process ⇒ acetone
157) The reaction of benzene with CO and HCl in the presence of anhydrous AlCl₃ gives a compound X. X can also be obtained from which of the following reaction?
A) Benzyl alcohol with CrO₃-H₂SO₄
B) Toluene with KMnO₄—OH⁻
C) Benzoyl chloride with H₂-Pd/BaSO₄
D) Benzonitrile with (i) LiAlH₄ (ii) H₃O⁺
View Answer
C) Benzoyl chloride with H₂-Pd/BaSO₄
Explanation:Given reaction:
Benzene + CO + HCl / AlCl₃
This is **Gattermann–Koch reaction**
Product:
X = Benzaldehyde (C₆H₅CHO)
Now check options:
(A) Benzyl alcohol + CrO₃/H₂SO₄
→ Strong oxidation → Benzoic acid ✘
(B) Toluene + KMnO₄/OH⁻
→ Side chain oxidation → Benzoic acid ✘
(C) Benzoyl chloride + H₂/Pd-BaSO₄
→ Rosenmund reduction → Benzaldehyde ✔
(D) Benzonitrile + LiAlH₄ → amine ✘
158) What is the product ‘Z’ in the given sequence of reactions?
A) A phenyl ether with an ortho-OH group
B) A phenyl ether with an ortho-COOH group
C) A phenyl ether with a meta-OH group
D) A phenyl ether with a para-OH group
View Answer
B) A phenyl ether with an ortho-COOH group
Explanation:Orientation effect
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