Question

Ratio of sigma ($\sigma$) and pi ($\pi$) bonds is maximum in:

• A. Naphtalene
• B. Tetra cyanomethane
• C. Enolic form of urea
• D. Equal in all

Answer 1

The correct option is C Enolic form of urea

(a)


Number of sigma bonds $=19$
Number of pi bonds $=5$
Ratio of $\frac{\sigma }{\pi }=\frac{21}{5}=4.2$

(b)


Number of sigma bonds $=8$
Number of pi bonds $=8$
Ratio of $\frac{\sigma }{\pi }=\frac{8}{8}=1$

(c)
Number of sigma bonds $=7$
Number of pi bonds $=1$
Ratio of $\frac{\sigma }{\pi }=\frac{7}{1}=7$