Question

How many $\sigma$ and $\pi$ bonds are present in $HC\equiv C-CH=CH-{CH}_3$?

• A. $9\sigma ,4\pi$
• B. $10\sigma ,3\pi$
• C. $6\sigma ,6\pi$
• D. $5\sigma ,5\pi$

Answer 1

The correct option is B $10\sigma ,3\pi$

Answer:-

$H-C\stackrel{\pi }{\underset{\pi }{\equiv }}C-\underset{H}{\underset{|}{C}}\stackrel{\pi }{=}\underset{H}{\underset{|}{C}}-\stackrel{H}{\stackrel{|}{\underset{H}{\underset{|}{C}}}}-H$

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

No. of $\sigma$ bonds = 10

No. of $\pi$ bonds = 2+1 = 3 ( two from one triple bond and one from a double bond).