Roni posted an Question
October 09, 2021 • 09:28 am 30 points
  • IIT JAM
  • Chemistry (CY)

Nmr please answer my questions as soon as possible gate pyq 2013

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  • Shreyasi majumdar 1 Best Answer

    correct option is b. Due to resonance C and N bond gets double bond character at r.t and rotation is restricted with makes the two set of methyl protons different, thus giving two singlets. As we increase the temperature, bond rotation becomes easier and hence at 150°, the two methyl groups become identical and give a singlet. https://youtu.be/vnUO0Myge90

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