DUET 2019 M.Sc. Chemistry Question Paper with Answer Key PDF (July 7 - Shift 3)

DUET Questions

• 1.

  Most stable carbocation is

  • 

  • 

  • 

  • 

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• 2.

  Sigmoid growth curve is represented by

  • $ dN/dt=rN $
  • $ dN/dt=rN\,\,(1-N/K) $
  • $ Nt/No +B +I-D-E $
  • $ dN/dt=1-N/K $
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• 3.

  During the phenomenon of resonance

  • the amplitude of oscillation becomes large
  • the frequency of oscillation becomes large
  • the time period of oscillation becomes large
  • All of the above
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• 4.

  Phagocytosis and pinocytosis are collectively termed as

  • endocytosis
  • suspension feeding
  • omnivores
  • mucous trap
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• 5.

  In the given structure of a compound, the correct various bond moments direction involving are shown as

  • $ Br\underline{\leftarrow }N\underline{\leftarrow }CH_{2}\underline{\to }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
  • $ Br\underline{\leftarrow }N\underline{\leftarrow }CH_{2}\underline{\leftarrow }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
  • $ Br\underline{\leftarrow }N\underline{\to }CH_{2}\underline{\leftarrow }SiH_{2}\to CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
  • $ Br\underline{\leftarrow }N\underline{\to }CH_{2}\underline{\to }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\to }CH_{3} $
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• 6.

  Which will undergo fastest $82$ substitution reaction when treated with $NaOH$?

  • $H_5C_2 - \underset{\overset{|}{H}}{\overset{\underset{|}{C}H_3}{C}} - Br$
  • $CH_3 - \underset{\overset{|}{C}H_3}{\overset{\underset{|}{C}H_3}{C}} - Br$
  • $H - \underset{\overset{|}{C_2}H_5}{\overset{\underset{|}{C}H_3}{C}} - Br$
  • $H - \underset{\overset{|}{Br}}{\overset{\underset{|}{H}}{C}} - CH_2 - CH_2 - CH_3$
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