Hydrocarbons · JEE Main previous year questions

2024 6 questions

1. Q802024 · 9 Apr 2024 · Shift 2

   The incorrect statement regarding ethyne is

   1. A.The carbon-carbon bond in ethyne is weaker than that in ethene
   2. B.Both carbons are $\mathrm{sp}$ hybridised
   3. C.The $\mathrm{C}-\mathrm{C}$ bond in ethyne is shorter than that in ethene
   4. D.Ethyne is linear
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   Answer: A

2. Q632024 · 8 Apr 2024 · Shift 2

   Given below are two statements : Statement (I) : All the following compounds react with p-toluenesulfonyl chloride. ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{N}{\mathrm{H}}_2({\mathrm{C}}_6{\mathrm{H}}_5{)}_2\mathrm{NH}({\mathrm{C}}_6{\mathrm{H}}_5{)}_3\mathrm{N}$ Statement (II) : Their products in the above reaction are soluble in aqueous $\mathrm{NaOH}$. In the light of the above statements, choose the correct answer from the options given below :

   1. A.Statement I is false but Statement II is true
   2. B.Both Statement I and Statement II are true
   3. C.Both Statement I and Statement II are false
   4. D.Statement I is true but Statement II is false
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   Answer: C

3. Q622024 · 6 Apr 2024 · Shift 2
   
   1. A.$\text{(III)}>\text{(IV)}>\text{(II)}>\text{(I)}$
   2. B.$\text{(III)}>\text{(I)}>\text{(II)}>\text{(IV)}$
   3. C.$\text{(II)}>\text{(IV)}>\text{(III)}>\text{(I)}$
   4. D.$\text{(IV)}>\text{(I)}>\text{(II)}>\text{(III)}$
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   Answer: B

4. Q762024 · 4 Apr 2024 · Shift 2

   Common name of Benzene - 1,2 - diol is -

   1. A.catechol
   2. B.quinol
   3. C.o-cresol
   4. D.resorcinol
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   Answer: A

5. Q902024 · 1 Feb 2024 · Shift 2· Numerical answer

   $10\text{ mL}$ of gaseous hydrocarbon on combustion gives $40\text{ mL}$ of $\mathrm{C}{\mathrm{O}}_2(\mathrm{g})$ and $50\text{ mL}$ of water vapour. Total number of carbon and hydrogen atoms in the hydrocarbon is ________ .

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   Answer: 14

6. Q692024 · 31 Jan 2024 · Shift 2

   The correct order of reactivity in electrophilic substitution reaction of the following compounds is : A: benzene, B: ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}{\mathrm{H}}_3$, C: ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}$, D: ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{N}{\mathrm{O}}_2$

   1. A.B > C > A > D
   2. B.B > A > C > D
   3. C.D > C > B > A
   4. D.A > B > C > D
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   Answer: B