Question

indicate sigma and pie bonds in CH2=C=CH2CH2(PH)​

Answer 1

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There are seven sigma bonds and three pi bonds in CH2=CH-CH=CH2.

From left till right the carbons are one, two, three, and four: 3H are attached to 1C, so there are three sigma bonds.

In C2 one sigma bond and one pi bond are present.

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