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  4. The number of σ - and π -bonds present in pent-4-ene, 1 -yne is

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

AIIMSAIIMS 2002Organic Chemistry – Some Basic Principles and Techniques

Solution:

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No. of $(\sigma)$ bonds $-4( C - C )+6( C - H )=10$

No. of $\pi$ - bonds $-1(C=C)+2(C \equiv C)=3$