Which of (a)-(d) shows the increasing order of basicity of compounds 1-4? 1 NH₂ O a. 4 <3 <2<1 O b. 1<2<4 <3 O c. 1<2<3 < 4 O d. 2 <1 < 3 < 4 2 NH NH₂ 3 NH H₂N NH₂ 4 NH

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