Chemistry

If I am given a molecular hydrocarbon structure, how would I be able to tell how sp3 hybridized carbons it possesses?

Like my current question asks How many sp3-hydridized carbon atoms does 11-cis-retinal possess?

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  1. Look at the carbon atoms and what is attached to them. If they have a double bond they are sp2 hybridized.
    For example,
    H3C-CH3(ethane) has two C atoms each with sp3 hybridization.
    But H2C=CH2 (ethene)has sp2 hybridization for each C atom.
    H3C-CH2=CH2 has the left most C atom with sp3 and the two right most C atoms with sp2.

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