Hydrocarbons · JEE Main previous year questions

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2023 10 questions

Q712023 · 13 Apr 2023 · Shift 2
Match List I with List II 1 - Bromopropane is reacted with reagents in List I to give product in List II | LIST I - Reagent | LIST II - Product | | :--- | :--- | | A. $KOH (alc)$ | I. Nitrile | | B. $KCN (alc)$ | II. Ester | | C. $AgNO_{2}$ | III. Alkene | | D. $H_{3} CCOOAg$ | IV. Nitroalkane | Choose the correct answer from the options given below:
1. A.A-I, B-II, C-III, D-IV
2. B.A-IV, B-III, C-II, D-I
3. C.A-III, B-I, C-IV, D-II
4. D.A-I, B-III, C-IV, D-II
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Answer: C
Q732023 · 10 Apr 2023 · Shift 1
1. A.(A), (B) and (D) only
2. B.(A), (B), (C) and (D)
3. C.(B), (C) and (D) only
4. D.(A), (C) and (D) only
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Answer: B
Q862023 · 8 Apr 2023 · Shift 1· Numerical answer
Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of $O_{3}$ per mole of (X) and gives one mole each of ethanal and propanone is ___________ $g mo l^{- 1}$ (Molar mass of $C : 12 g mo l^{- 1}, H : 1 g mo l^{- 1}$ )
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Answer: 70
Q672023 · 31 Jan 2023 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q702023 · 31 Jan 2023 · Shift 2
A hydrocarbon ' X ' with formula $C_{6} H_{8}$ uses two moles of $H_{2}$ on catalytic hydrogenation of its one mole. On ozonolysis, ' X ' yields two moles of methane dicarbaldehyde. The hydrocarbon ' X ' is:
1. A.hexa-1, 3, 5-triene
2. B.cyclohexa-1, 4-diene
3. C.cyclohexa - 1,3 - diene
4. D.1-methylcyclopenta-1, 4-diene
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Answer: B
Q902023 · 29 Jan 2023 · Shift 1· Numerical answer
17 mg of a hydrocarbon (M.F. $C_{10} H_{16}$ ) takes up 8.40 mL of the $H_{2}$ gas measured at $0^{\circ} C$ and 760 mm of Hg. Ozonolysis of the same hydrocarbon yields $C H_{3} - CO - C H_{3}$ , $H - CO - H$ , $H - CO - C H_{2} - C H_{2} - CO - CO - H$ The number of double bond/s present in the hydrocarbon is ____.
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Answer: 3
Q722023 · 29 Jan 2023 · Shift 2
The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement)
1. A.2-Bromo-3,3-dimethylpentane
2. B.2-Bromopropane
3. C.1-Bromo-2-methylbutane
4. D.2-Bromopentane
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Answer: D
Q812023 · 25 Jan 2023 · Shift 2· Numerical answer
28.0 L of $C O_{2}$ is produced on complete combustion of 16.8 L gaseous mixture of ethene and methane at $2 5^{\circ} C$ and 1 atm. Heat evolved during the combustion process is ____ kJ. Given : $Δ H_{c} (C H_{4}) = - 900 kJ mo l^{- 1}$ $Δ H_{c} (C_{2} H_{4}) = - 1400 kJ mo l^{- 1}$
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Answer: 847
Q882023 · 25 Jan 2023 · Shift 2· Numerical answer
Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is ____ (Given : Molar mass of A = 84 $g mo l^{- 1}$ )
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Answer: 12
Q642023 · 24 Jan 2023 · Shift 2
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Benzene is more stable than hypothetical cyclohexatriene Reason R : The delocalised $π$ electron cloud is attracted more strongly by nuclei of carbon atoms. In the light of the above statements, choose the correct answer from the options given below:
1. A.A is true but R is false
2. B.Both A and R are correct and R is the correct explanation of A
3. C.Both A and R are correct but R is NOT the correct explanation of A
4. D.A is false but R is true
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Answer: B