Aldehydes, Ketones & Acids · JEE Main previous year questions

2020 3 questions

1. Q602020 · 3 Sept 2020 · Shift 2

   The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is : Propanal, Benzaldehyde, Propanone, Butanone

   1. A.Butanone < Propanone < Benzaldehyde < Propanal
   2. B.Benzaldehyde < Butanone < Propanone < Propanal
   3. C.Propanal < Propanone < Butanone < Benzaldehyde
   4. D.Benzaldehyde < Propanal < Propanone < Butanone
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   Answer: A

2. Q512020 · 9 Jan 2020 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: A

3. Q552020 · 7 Jan 2020 · Shift 1

   At $35^{\circ }\mathrm{C}$, the vapour pressure of $\mathrm{C}{\mathrm{S}}_2$ is $512\mathrm{mm}\mathrm{Hg}$ and that of acetone is $344\mathrm{mm}\mathrm{Hg}$. A solution of $\mathrm{C}{\mathrm{S}}_2$ in acetone has a total vapour pressure of $600\mathrm{mm}\mathrm{Hg}$. The false statement amongst the following is :

   1. A.$\mathrm{C}{\mathrm{S}}_2$ and acetone are less attracted to each other than to themselves.
   2. B.a mixture of $100\mathrm{ml}$. $\mathrm{C}{\mathrm{S}}_2$ and $100\mathrm{ml}$. acetone has a volume $<200\mathrm{ml}$.
   3. C.Heat must be absorbed in order to produce the solution at $35^{\circ }\mathrm{C}$
   4. D.Raoult's law is not obeyed by this system.
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   Answer: B