Q.1-1-25b - Organic Chemistry (Mcmurry)

Question

Why can’t molecules with the following formulas exist

a) $C{H}_5$ (b) $C_2{H}_{6}N$ (c) $C_3{H}_{5}Br$

Step-by-Step Solution

Answer

Answer

The formula $C_2{H}_{6}N$ can’t exist.

Step 1: Stability of molecule

A structure formed by the guidelines of octet and valence electrons is considered stable. In contrast, a system with atoms without an entire outer shell of electrons is unstable.

Step 2: Given molecule can’t exist

The formula $C_2{H}_{6}N$ requires that carbon exceeds four bonds, or be short of two outer shell electrons or nitrogen should remain except for three bonds.

Step 3: Evidence for non-existence

The structures are represented as follows.

                          C-N bond formation