Considering the $X$-axis as the internuclear axis,which of the following will not form a sigma $(\sigma)$ bond and why?

  • A
    $1s$ and $1s$
  • B
    $1s$ and $2p_x$
  • C
    $2p_y$ and $2p_y$
  • D
    $1s$ and $2s$

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How many $\sigma$ and $\pi$ bonds are present in each of the following molecules?
$(a)$ $HC \equiv C-CH=CH-CH_3$
$(b)$ $CH_2=C=CH-CH_3$

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