In which of the following species is the underlined carbon having sp3 hybridisation?

Question

In which of the following species is the underlined carbon having sp³ hybridisation?

$C{H_3}\underline C OOH$

$C{H_3}\underline C H_2OH$

$C{H_3}\underline C OCH_3$

$C{H_2} = \underline C H - C{H_3}$

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