Which of the following is incorrect about the given molecules

Options

A. The correct order of basic strength `(K_(b))` is `a gt b gt c`
B. The correct order of C-N bond length is `:a gt b gt c`
C. The correct C=C bond length order is `a gt b gt c`
D. The correct `pK_(b)` order is : `c gt b gt a`

Answer

C

Explanation

The polarity of N-H bond will be maximum on the N-atom which is most electron deficient.