The state of hybridization of carbons 1,3 and 5 are sp,sp3 and sp2 respectively. $ {{\C↖{6}H}_3}↙{sp^3}- {{\C↖{5}H}}↙{sp^2}={ {\C↖{4}H}}↙{sp^2}- {{\C↖{3}H}_2}↙{sp^3}- {{\C}↖{2} }↙{sp}≡ {{\C↖{1}H}}↙{sp}$ The state of hybridization of carbons 1,3 and 5 are sp,sp3 and sp2 respectively.