The number of $\sigma$ - and $\pi$-bonds present in pent-4-ene-1-yne is

The number of $\sigma$ - and $\pi$-bonds present in pent-4-ene-1-yne is
  1. 10,3
  2. 4,9
  3. 3,10
  4. 9,4

Solution

Pent-4-ene-1-yne $\stackrel{1}{\mathrm{C}} \mathrm{H} \equiv \stackrel{2}{\mathrm{C}}-\stackrel{3}{\mathrm{C}} \mathrm{H}_2-\stackrel{4}{\mathrm{C}} \mathrm{H}=\stackrel{5}{\mathrm{C}} \mathrm{H}_2$ No. of $\sigma$-bonds $-4(\mathrm{C}-\mathrm{C})+6(\mathrm{C}-\mathrm{H})=10$ No. of $\pi$-bonds $-1(\mathrm{C}=\mathrm{C})+2(\mathrm{C} \equiv \mathrm{C})=3$

Asked in: NEET 2005

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