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Answer the following.
Arrange the following in the increasing order of their basic strength: , , .
Arrange the following in the increasing order of their basic strength: $\text{C}_2\text{H}_5\text{NH}_2$, $\text{C}_6\text{H}_5\text{NH}_2$, $(\text{C}_2\text{H}_5)_2\text{NH}$.
Answer
Answer
AIOrder, first to last: $\text{C}_6\text{H}_5\text{NH}_2$, $\text{C}_2\text{H}_5\text{NH}_2$, $(\text{C}_2\text{H}_5)_2\text{NH}$
$\mathrm{C_6H_5NH_2} < \mathrm{C_2H_5NH_2} < (\mathrm{C_2H_5})_2\mathrm{NH}$
Aniline is weakest as the lone pair is delocalised into the ring; the +I effect of ethyl groups makes the secondary amine the strongest.
From ISC 2022 Chemistry - Specimen paper (Semester 2), Paper 1, question 6(i).