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Chemistry · 2022 · 2 marks
CBSE 2022 · Region 1 · Set 1 · Q2
Arrange the following compounds as directed: (any Two) (i) In decreasing order of basic strength in aqueous solution: C_2 H_5 NH_2,( C_2 H_5)_2 NH,(…
Arrange the following compounds as directed : (any Two)
(i)
In decreasing order of basic strength in aqueous solution : \[\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2},\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH},\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{~N} \]
(ii)
In increasing order of solubility in water : \[\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH}, \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}, \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2} \]
(iii)
In decreasing order of their pKb values : \[\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}, \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}, \mathrm{NH}_{3} \]
Marking-scheme solution
(i) \(\displaystyle \left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH}>\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{~N}>\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}\)
(ii) \(\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}<\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH}<\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}\)
(iii) \(\displaystyle \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}>\mathrm{NH}_{3}>\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}\)
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.