Aldehydes, Ketones & Acids · JEE Main previous year questions

2021 5 questions

1. Q762021 · 25 Jul 2021 · Shift 2

   A biodegradable polyamide can be made from :

   1. A.Glycine and isoprene
   2. B.Hexamethylene diamine and adipic acid
   3. C.Glycine and aminocaproic acid
   4. D.Styrene and caproic acid
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   Answer: C

2. Q702021 · 20 Jul 2021 · Shift 1
   
   1. A.(I), (III) and (IV) only
   2. B.Only (IV)
   3. C.Only (II)
   4. D.(III) and (IV) only
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   Answer: C

3. Q662021 · 18 Mar 2021 · Shift 2

   In the reaction of hypobromite with amide, the carbonyl carbon is lost as :

   1. A.$\mathrm{C}{\mathrm{O}}_2$
   2. B.$\mathrm{CO}$
   3. C.$\mathrm{HC}{\mathrm{O}}_3^{-}$
   4. D.$\mathrm{C}{\mathrm{O}}_3^{2-}$
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   Answer: D

4. Q812021 · 18 Mar 2021 · Shift 2· Numerical answer

   In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula $[\mathrm{Ag}(\mathrm{N}{\mathrm{H}}_3{)}_2{]}^{+}$ per aldehyde group to form silver mirror is ____. (Round off to the Nearest Integer).

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   Answer: 2

5. Q842021 · 18 Mar 2021 · Shift 2· Numerical answer
   
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   Answer: 78