The ratio of sp to sp2 carbons in HC≡C−CH=CH2 is --------------

[Step 1]:Double bonded carbon is sp2 hybridized and triple bonded carbon is sp hybridized[Step 2]: HCSP≡CSP−CHSP2=CH2SP2[Step 3]:Number of SP hybridized carbons are two .Number of SP2 hybridized carbons are two[Step 4]:Therefore the ratio of SP carbons to SP2 carbons is 22i.e one.