What are hybridisation states of each carbon atom in the following compounds?

CH2=C=O, CH3CH=CH2, (CH3)2CO, CH2=CHCN, C6H6

 
C2H2=C1=O

C-1 is sp2 hybridised


C-2 is sp hybridised

{trick: single bond is count as 1 and double bond is count as 1}
C3H3C2H=C1H2

C-1 is sp2 hybridised

C-2 is sp2 hybridised

C-3 is sp3 hybridised

  

 

{trick: single bond is count as 1 and double bond is count as 1}

C-1 is sp3 hybridised

C-2 is  sp2 hybridised

C-3 is sp3 hybridised

  

{trick: single bond is count as 1 and double bond is count as 1}

C-1 is sp2 hybridised

C-2 is  sp2 hybridised

C-3 is sp hybridised

  

{trick: single bond is count as 1,double bond is count as 1 and triple bond is count as 1.}
C6H6  All the carbons in benzene ring are sp2 hybridised.  

{trick: single bond is count as 1 and double bond is count as 1}
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