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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 25 February 2021, Shift 2, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

The major product of the following reaction is : CH3CH2CH=CH2→Rh catalystH2/CO\mathrm{CH_3CH_2CH{=}CH_2}\xrightarrow[\text{Rh catalyst}]{\mathrm{H_2/CO}}

The figure, in words

Option 4 drawn as CH3CH2C=CH2 with a vertical bond from the C down to CHO.
  1. (1)CH3CH2CH2CH2CHO\mathrm{CH_3CH_2CH_2CH_2CHO}Official answer
  2. (2)CH3CH2CH2CHO\mathrm{CH_3CH_2CH_2CHO}
  3. (3)CH3CH2CH=CH−CHO\mathrm{CH_3CH_2CH{=}CH{-}CHO}
  4. (4)[figure: CH3CH2C=CH2\mathrm{CH_3CH_2C{=}CH_2} with a CHO\mathrm{CHO} group drawn below the C bearing the double bond]

Official answer

Option 1

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Hydrogen and Hydrides
Idea tested
Hydroformylation of Olefins

Same topic in other shifts

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.