Hydrocarbons · JEE Main previous year questions

2019 3 questions

1. Q672019 · 12 Apr 2019 · Shift 2

   25 g of an unknown hydrocarbon upon burning produces 88 g of ${\text{CO}}_2$ and 9 g of ${\text{H}}_2\text{O}$. This unknown hydrocarbon contains :

   1. A.18 g of carbon and 7 g of hydrogen
   2. B.20 g of carbon and 5 g of hydrogen
   3. C.22 g of carbon and 3 g of hydrogen
   4. D.24 g of carbon and 1 g of hydrogen
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   Answer: D

2. Q722019 · 10 Apr 2019 · Shift 1

   At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of ${\mathrm{O}}_2$ for complete combustion, and 40 mL of $\mathrm{C}{\mathrm{O}}_2$ is formed. The formula of the hydrocarbon is :

   1. A.${\mathrm{C}}_4{\mathrm{H}}_7\mathrm{Cl}$
   2. B.${\mathrm{C}}_4{\mathrm{H}}_6$
   3. C.${\mathrm{C}}_4{\mathrm{H}}_8$
   4. D.${\mathrm{C}}_4{\mathrm{H}}_{10}$
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   Answer: B

3. Q762019 · 8 Apr 2019 · Shift 2

   Which one of the following alkenes when treated with HCl yields majorly an anti Markovnikov product?

   1. A.$\mathrm{Cl}-\mathrm{CH}=\mathrm{C}{\mathrm{H}}_2$
   2. B.${\mathrm{F}}_3\mathrm{C}-\mathrm{CH}=\mathrm{C}{\mathrm{H}}_2$
   3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{O}-\mathrm{CH}=\mathrm{C}{\mathrm{H}}_2$
   4. D.${\mathrm{H}}_2\mathrm{N}-\mathrm{CH}=\mathrm{C}{\mathrm{H}}_2$
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   Answer: B