Question

Match the compounds/reactions in column I with their name of the structure in column II. Matching can be one or more than one.

Answer 1

Ladenburg prism formula: A three dimensional structure having prism nature. The formula fails

on account of reduction and addition reaction, X-ray analysis later on also confirmed that $C_6{H}_6$ has planer structure (image 1)

Clause diagonal formula: Each carbon is linked to three other carbon atomes i e. two neighbours and one diagonally opposite. (image 2)

This formula also fails on account of reduction and addition reactions.

Dewar's parallel formula: It consists of parabola structure. It fails on account of unsymmetrical nature and different bond lengths in benzene. (each $C-C$ bond in $C_6{H}_6$ is $1.40\mathring{A}$) (image 3)

Armstrong and Beyer's formula : The centric formula proposed by Armstrong and Baeyer

suggest that fourth valence of each carbon atom is directed towards centre. It failed

on account of modern concept of valence which does not suggest any concept for

centrally directed valence. (image 4)