Question

The ratio of number of sigma (σ) and pi (π) bonds in 2- butynal is ……

(a) 8/3 

(b) 5/3 

(c) 8/2 

(d) 9/2

Answer 1

(a) 8/3

no. of σ bonds = 8 [4C – H; 3C – C; 1C— O]

no.of π bonds = 3 [2C – C; 1C – O]

∴ ratio = \(\frac{8}{3}\)