In which of the following molecules,2 pi bond | vedclass

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(C) $I$. $CH_{3}-CH_{3}$ $(C_{2}H_{6})$: Contains only $\sigma$ bonds. (No $\pi$ bond) $II$. $CH_{2}=CH_{2}$ $(C_{2}H_{4})$: Contains $1$ $\sigma$ bon

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$C_{2}H_{2}$

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(C) $I$. $CH_{3}-CH_{3}$ $(C_{2}H_{6})$: Contains only $\sigma$ bonds. (No $\pi$ bond) $II$. $CH_{2}=CH_{2}$ $(C_{2}H_{4})$: Contains $1$ $\sigma$ bond and $1$ $\pi$ bond between carbons. $III$. $CH \equiv CH$ $(C_{2}H_{2})$: Contains $1$ $\sigma$ bond and $2$ $\pi$ bonds between carbons. $IV$. $CH_{3}-CH=CH_{2}$ $(C_{3}H_{6})$: Contains $1$ $\pi$ bond in the $C=C$ double bond.

In which of the following molecules,$2$ $\pi$ bonds are present?

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