Chemistry - GOC Question with Solution | TestHub

(A) is correct, as the lone pair on N is less electronegative than on O. (B) is correct, since in the gas phase only the +I effect acts. (D) is the Hückel rule.

(C) is wrong : the C-N bond in hydrogen cyanide is a triple bond (about 1.16 angstrom), and the C-N bond in aniline is single with a little double-bond character (about 1.40 angstrom). The bond in aniline is longer, not shorter.