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Q.

The number of sigma (σ) and pi (π) bonds in pent - 2 - en - 4 -Yne is :

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a

13 σ bonds and no π bond

b

10 σ bonds and 3 π bonds

c

σ bonds and 5π bonds

d

11 σ bonds and 2π bonds

answer is B.

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Detailed Solution

Pent-2-ene-4-yne. The correct IUPAC name is Pent- 1-yne-3-ene
CH3CH=CHCCH
Total σ=CC+CH
                   4    +    6     = 10
Total  π=C=C+CC
                    1     +    2    = 3

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