$CH_3-CH=CH-CH_2OH \stackrel{PCC}{\longrightarrow} CH_3-CH=CH-CHO$ What is the hybridisation change involved at $C-1$ in the above reaction?

Question

$sp^2$ to $sp^3$

$sp$ to $sp^2$

$sp^3$ to $sp$

$sp^3$ to $sp^2$

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