Q21. Which of the following compounds will show geometrical isomerism?
A 2-methyl-2-butene B propene C 1-phenylpropene D 1-butene E Question not attempted
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Correct answer: 1-phenylpropene
Q22. The incorrect statement/s among the following is/are — (i) According to IUPAC nomenclature, Lawrencium is Unnilbium. (ii) s-block elements together with p-block elements are called main group elements. (iii) The second ionization enthalpy value of an element will be lower than the first ionization enthalpy. (iv) Electron gain enthalpy value of O and F is less negative than that of S and Cl respectively
A (iii) only B (ii) and (iv) only C (iii) and (iv) only D (i) and (iii) only E Question not attempted
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Correct answer: (i) and (iii) only
Q23. Calculate the enthalpy of the following reaction at 25°C — C₂H₄(g) + H₂(g) → C₂H₆(g). The heats of combustion of ethene, hydrogen and ethane are −337.0 kcal, −68.4 kcal and −373.0 kcal respectively at 25°C
A 104.4 kcal B −32.4 kcal C −104.4 kcal D 641.6 kcal E Question not attempted
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Correct answer: −32.4 kcal
Q24. From the following thermochemical equations, the enthalpy of formation of benzene will be — (i) C₆H₆(l) + 15/2 O₂(g) → 6CO₂(g) + 3H₂O(l); ΔH = −3267.7 kJ. (ii) C(s) + O₂(g) → CO₂(g); ΔH = −393.5 kJ. (iii) H₂(g) + 1/2 O₂(g) → H₂O(l); ΔH = −286.2 kJ
A 2588 kJ B −2588 kJ C 48.1 kJ D −48.1 kJ E Question not attempted
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Correct answer: 48.1 kJ
Q25. RNH₂ + CHCl₃ + KOH (alcoholic) —Δ→ ? The product of the above reaction is —
A RCN B RNC C ROH D RCl E Question not attempted
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Correct answer: RNC
Q26. The Mulliken symbols used for two-dimensional and three-dimensional irreducible representations (IRs) are, respectively —
A E and G B B and E C E and T D A and B E Question not attempted
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Correct answer: E and T
Q27. The rate constants of a first-order reaction at 100 K and 200 K temperature are 0.02 s⁻¹ and 0.2 s⁻¹ respectively. Activation energy of the reaction is [R = 2 cal K⁻¹ mol⁻¹] —
A 248.03 cal B 200.0 cal C 3829.4 cal D 921.20 cal E Question not attempted
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Correct answer: 921.20 cal
Q28. The conformational enantiomers of cis-1,2-dimethylcyclohexane among the following are — (a) 1e,2a; (b) 1a,2e; (c) 1e,2e; (d) 1a,2a. Correct option is —
A (c) and (d) B (a) and (b) C (b) and (c) D (a) and (c) E Question not attempted
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Correct answer: (a) and (b)
Q29. In which of the following carbocations, o-bond electrons are involved in the bridged cation formation?
A Cyclopropyl methyl cation B Cyclopropenyl cation C Allyl cation D Benzylic cation E Question not attempted
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Correct answer: Cyclopropyl methyl cation
Q30. How many lines are expected in the hyperfine structure of ESR spectrum of naphthalene negative ion [C₁₀H₈]⁻?
A 25 B 75 C 9 D 4 E Question not attempted
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Correct answer: 25
Q31. The correct order of melting point of hydrides of group-17 elements is —
A HF > HCl > HBr > HI B HI > HBr > HCl > HF C HCl > HF > HBr > HI D HI > HF > HBr > HCl E Question not attempted
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Correct answer: HI > HF > HBr > HCl
Q32. Ziegler-Natta catalyst is used to prepare which of the following polymer?
A LDPE B HDPE C PVC D Teflon E Question not attempted
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Correct answer: HDPE
Q33. Sodium salt of which acid will be needed for the preparation of propane by decarboxylation method?
A CH₃CH₂COONa B CH₃CH₂CH₂CH₂COONa C CH₃CH(CH₃)COONa D CH₃COOH E Question not attempted
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Correct answer: CH₃CH(CH₃)COONa
Q34. Pellagra disease is caused due to the deficiency of the following vitamin —
A Vitamin A B Vitamin B₁ C Vitamin D D Vitamin B₃ E Question not attempted
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Correct answer: Vitamin B₃
Q35. The correct expression of (∂U/∂V)ₜ for a gas is —
A [T(∂P/∂T)ᵥ − P] B [T(∂P/∂T)ᵥ + P] C [V + T(∂V/∂T)ₚ] D [V − T(∂V/∂T)ₚ] E Question not attempted
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Correct answer: [T(∂P/∂T)ᵥ − P]
Q36. Excess of which ion in drinking water causes methemoglobinemia?
A SO₄²⁻ B Cl⁻ C NO₃⁻ D F⁻ E Question not attempted
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Correct answer: NO₃⁻
Q37. Consider the following statements — Statement (I): Diamagnetic substances are weakly attracted by a magnetic field. Statement (II): Diamagnetic substances are weakly magnetised in a magnetic field in the opposite direction. Choose the correct option —
A Statement (I) is false but Statement (II) is true B Both Statement (I) and Statement (II) are true C Statement (I) is true but Statement (II) is false D Both Statement (I) and Statement (II) are false E Question not attempted
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Correct answer: Statement (I) is false but Statement (II) is true
Q38. Predict the major product of the reaction given below — CH₃–CH=CH₂ + Cl₂, H₂O → ?
A 1-chloro-2-propanol B Ethylene chlorohydrin C n-chloropropane D 2-chloro-1-propanol E Question not attempted
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Correct answer: 1-chloro-2-propanol
Q39. Identify the major product formed in the reaction shown in the question paper (Weinreb-type amide + allylic alcohol, H⁺/heat) —
A Me₂N–C(=O)–CH₂–CH=CH–R B OHC–CH₂–CH=CH–R C MeO–C(=O)–CH₂–CH=CH–R D HO–C(=O)–CH₂–CH=CH–R E Question not attempted
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Correct answer: Me₂N–C(=O)–CH₂–CH=CH–R
Q40. The correct plot of log(k₀/kₕ) versus √I for the base-catalysed hydrolysis of ethyl acetate is —
A Straight line with positive slope (steeper) B Straight line with positive slope (less steep) C Horizontal line D Straight line with negative slope E Question not attempted
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Correct answer: Horizontal line