Hydrocarbons · JEE Main previous year questions

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2022 13 questions

Q692022 · 29 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q682022 · 29 Jul 2022 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q712022 · 29 Jul 2022 · Shift 2
When ethanol is heated with conc. $H_{2} S O_{4}$ , a gas is produced. The compound formed, when this gas is treated with cold dilute aqueous solution of Baeyer's reagent, is
1. A.formaldehyde
2. B.formic acid
3. C.glycol
4. D.ethanoic acid
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Answer: C
Q682022 · 28 Jul 2022 · Shift 2
Arrange the following in increasing order of reactivity towards nitration A. p-xylene B. bromobenzene C. mesitylene D. nitrobenzene E. benzene Choose the correct answer from the options given below
1. A.C < D < E < A < B
2. B.D < B < E < A < C
3. C.D < C < E < A < B
4. D.C < D < E < B < A
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Answer: B
Q872022 · 27 Jul 2022 · Shift 2· Numerical answer
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Answer: 530
Q792022 · 26 Jul 2022 · Shift 1
Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of " $X$ " with 6-equivalents of " $Y$ ". " $X$ " and " $Y$ ", respectively are :
1. A. $B (OH)_{3}$ and $N H_{3}$
2. B. $B_{2} H_{6}$ and $N H_{3}$
3. C. $B_{2} H_{6}$ and $H N_{3}$
4. D. $N H_{3}$ and $B_{2} O_{3}$
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Answer: B
Q892022 · 26 Jul 2022 · Shift 1· Numerical answer
In the presence of sunlight, benzene reacts with $Cl_{2}$ to give product, X. The number of hydrogens in X is _________.
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Answer: 6
Q882022 · 30 Jun 2022 · Shift 1· Numerical answer
A hydrocarbon 'X' is found to have molar mass of 80. A $10.0 mg$ of compound 'X' on hydrogenation consumed $8.40 mL$ of $H_{2}$ gas (measured at STP). Ozonolysis of compound 'X' yields only formaldehyde and dialdehyde. The total number of fragments/molecules produced from the ozonolysis of compound 'X' is ___________.
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Answer: 4
Q682022 · 26 Jun 2022 · Shift 2
Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?
1. A. $Cr O_{3} / acetic acid, H_{3} O^{+}$
2. B. $Cr O_{3} / acetic anhydride, H_{3} O^{+}$
3. C. $KMn O_{4} / HCl, H_{3} O^{+}$
4. D. $CO / HCl$ , anhydrous $AlC l_{3}$
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Answer: B
Q732022 · 26 Jun 2022 · Shift 2
Which statement is NOT correct for p-toluenesulphonyl chloride?
1. A.It is known as Hinsberg's reagent.
2. B.It is used to distinguish primary and secondary amines.
3. C.On treatment with secondary amine, it leads to a product, that is soluble in alkali.
4. D.It doesn't react with tertiary amines.
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Answer: C
Q622022 · 25 Jun 2022 · Shift 2
At $2 5^{\circ} C$ and $1 atm$ pressure, the enthalpy of combustion of benzene (l) and acetylene (g) are $- 3268 kJ mo l^{- 1}$ and $- 1300 kJ mo l^{- 1}$ , respectively. The change in enthalpy for the reaction $3 C_{2} H_{2} (g) \to C_{6} H_{6} (l)$ , is :
1. A. $+ 324 kJ mo l^{- 1}$
2. B. $+ 632 kJ mo l^{- 1}$
3. C. $- 632 kJ mo l^{- 1}$
4. D. $- 732 kJ mo l^{- 1}$
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Answer: C
Q692022 · 25 Jun 2022 · Shift 2
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene. Reason R : Benzoic acid is soluble in hot water. In the light of the above statements, choose the most appropriate answer from the options given below.
1. A.Both A and R are true and R is the correct explanation of A.
2. B.Both A and R are true but R is NOT the correct explanation of A.
3. C.A is true but R is false.
4. D.A is false but R is true.
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Answer: D
Q702022 · 24 Jun 2022 · Shift 2
Given below are two statements : Statement I : The presence of weaker $π$ -bonds makes alkenes less stable than alkanes. Statement II : The strength of the double bond is greater than that of carbon-carbon single bond. In the light of the above statements, choose the correct answer from the options given below :
1. A.Both Statement I and Statement II are correct.
2. B.Both Statement I and Statement II are incorrect.
3. C.Statement I is correct but Statement II is incorrect.
4. D.Statement I is incorrect but Statement II is correct.
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Answer: A