Question

Why can’t molecules with the following formulas exist

a) $C{H}_5$ (b) $C_2{H}_{5}N$ (c)$C_3{H}_{5}B{r}_2$

Short answer

Answer

The formula $C_3{H}_{5}B{r}_2$can’t exist.

Step-by-step solution

Carbon Valency

Carbon can form four single bonds. In this case, one-carbon includes five bonds in one representation, which is impossible as carbon valency can’t exceed five.

Given molecule can’t exist

In other representation, carbon forms three bonds which are one bond less for its stability. The formula $C_3{H}_{5}B{r}_2$requires that carbon exceeds four bonds or be short of two outer shell electrons.

The representation is as follows.

$C_3{H}_{5}B{r}_2$Molecule can’t form

$C_3{H}_{5}B{r}_2$Molecule can’t form