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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedEasyConceptual

JEE Main 8 January 2020, Shift 2, Chemistry Q44

Question 44 of 75 in this shift, Chemistry question 19 of 25, Section A.

Among the compounds A and B with molecular formula C9H18O3\mathrm{C_9H_{18}O_3}, A is having higher boiling point the B. The possible structures of A and B are :

The figure, in words

All four options are pairs of drawn structures labelled A and B (six-membered rings with three substituents at alternate ring atoms); the ring-substituent labels printed are HO, OH, H3CO, OCH3.
  1. (1)A = [figure: six-membered ring with three branches at alternate ring atoms, each a single bend line ending in HO/OH]; B = [figure: six-membered ring with HO at one ring atom, OH at another, and a longer zigzag chain at the third ring atom ending in OH]
  2. (2)A = [figure: same as option 1 A: six-membered ring with three branches, each a single bend line ending in HO/OH]; B = [figure: six-membered ring with H3CO\mathrm{H_3CO}, OCH3\mathrm{OCH_3} and OCH3\mathrm{OCH_3} attached directly at alternate ring atoms]Official answer
  3. (3)A = [figure: six-membered ring with H3CO\mathrm{H_3CO}, OCH3\mathrm{OCH_3} and OCH3\mathrm{OCH_3} attached directly at alternate ring atoms]; B = [figure: six-membered ring with HO at one ring atom, OH at another, and a longer zigzag chain at the third ring atom ending in OH]
  4. (4)A = [figure: six-membered ring with H3CO\mathrm{H_3CO}, OCH3\mathrm{OCH_3} and OCH3\mathrm{OCH_3} attached directly at alternate ring atoms]; B = [figure: six-membered ring with three branches at alternate ring atoms, each a single bend line ending in HO/OH]

Official answer

Option 2

NTA final key (Jan 2020).