Question

Among $Me_3N, C_5H_5N$ and $MeCN$ ($Me$ = methyl group) the electronegativity of $N$ is in the order

• A. $MeCN > C_5H_5N > Me_3N$
• B. $C_5H_5N > Me_3N > MeCN$
• C. $Me_3N > MeCN > C_5H_5N$
• D. Electronegativity same in all

Answer 1

Answer: (A)

$MeCN > C_5H_5N > Me_3N$

Answer 2

$\because$ In $Me _{3} N \rightarrow N$ is $s p^{3}$-hybrid In $C _{5} H _{5} N \rightarrow N$ is $s p^{2}$-hybrid and in $MeCN \rightarrow N$ is $s p$-hybrid Also electronegativity of any element $\alpha \%$ $s$-character in hybrid orbitals. Thus, order of electronegativity for nitrogen is $MeCN > C _{5} H _{5} N < Me _{3} N$