The molecular weight of a hydrocarbon is 96. Index of hydrogen deficiency of the compound is 2. Which of the following structure is suitable for the hydrocarbon discussed? 

detailed solution

Correct option is D

Hydrocarbon having Index of hydrogen deficiency (IHD) 2 can be an alkyne, Alka-diene, cycloalkene or a bicyclic compound.  The general molecular formula for the compounds having IHD 2 is . From this we can calculate the number of carbons present in the hydrocarbon by using molecular weight (MW).CnH2n--2 = MW⇒12n + 2n--2 = MW ⇒n = MW + 214 number of Carbons, n = 96 + 214 = 9814 = 7The below are having same molecular formula so these two are suitable hydrocarbons for the given data.