Question

How many sigma and pi bonds are present in the following molecule given below:

$HC\equiv C-CH=CH-C{H}_3$

• A. sigma $C-C$ bonds $=4$, sigma $C-H$ bonds $=6$, pi C-C bonds $=3$
• B. sigma $C-C$ bonds $=5$, sigma $C-H$ bonds $=6$, pi $C-C$ bonds $=2$
• C. sigma $C-C$ bonds $=4$, sigma $C-H$ bonds $=2$, pi $C-C$ bonds $=5$
• D. sigma $C-C$ bonds$=4$, sigma $C-H$ bonds $=4$, pi $C-C$bonds $=4$

Answer 1

The correct option is A sigma $C-C$ bonds $=4$, sigma $C-H$ bonds $=6$, pi C-C bonds $=3$

A triple bond contains 1 sigma and 2 pi bond and a double bond contains 1 sigma and 1 pi bond.

$\pi Bonds=2+1=3$

$\sigma (C-C)=4$

$\sigma (C-H)=6$

Hence, option A is correct.