Question

Pick out the incorrect statement

• A. Red phosphorus consists of a complex chain structure and black phosphorus has a layer structure
• B. Nitrogen shows a little tendency for catenation, because $N - N$ single bond is very strong
• C. The maximum number of covalent bonds formed by nitrogen is four, since it has no $d$-orbitals in its valence shell
• D. The group $15$ elements do not form $M^{+5}$ ions, but $+5$ oxidation state is realized only through covalent bonding

Answer 1

Answer: (B)

Catenation $\propto 1/$size
$N$ has more catenation tendency due to is small size. $Sb$ and $Si$ doesn’t have catenation tendency.