Aldehydes, Ketones & Acids · JEE Main previous year questions

2009 2 questions

1. Q822009 · 27 Apr 2009 · Shift 1

   Which of the following on heating with aqueous $\mathrm{KOH}$, produces acetaldehyde ?

   1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{COCl}$
   2. B.$\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{Cl}$
   3. C.$\mathrm{C}{\mathrm{H}}_2\mathrm{ClC}{\mathrm{H}}_2\mathrm{Cl}$
   4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{CHC}{\mathrm{l}}_2$
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   Answer: D

2. Q832009 · 27 Apr 2009 · Shift 1

   In Cannizzaro reaction given below $2\mathrm{PhCHO}\stackrel{:\stackrel{(-)}{\mathrm{O}}\mathrm{H}}{\to }\mathrm{PhC}{\mathrm{H}}_2\mathrm{OH}+\mathrm{PhC}{\ddot{\mathrm{O}}}_2^{(-)}$ the slowest step is :

   1. A.the transfer of hydride to the carbonyl group
   2. B.the abstraction of proton from the carboxylic group
   3. C.the attack of $:\stackrel{(-)}{\mathrm{O}}\mathrm{H}$ at the carboxyl group
   4. D.the deprotonation of $\mathrm{PhC}{\mathrm{H}}_2\mathrm{OH}$
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   Answer: A