Why do you think that many important intermediates used in manufacturing organic chemicals...please help me. ?

Question

Why do you think that many important intermediates used in manufacturing organic chemicals have double or triple bonds?

Answer 1

Because compounds with double (alkenes) and triple bonds (alkynes) are very reactive!  A wonderful example of a chemical intermediate with great importance to industry, is epichlorohydrin.  Epichlorohydrin is employed to synthesize several prescription drugs (pharmaceutical industry) as a precursor or intermediate.  This epoxide can only be obtained from allyl chloride, ClCH2CH=CH2, an organic compound with a DOUBLE BOND.  ClCH2CH=CH2 + HCl/H20 --> ClCH2CHOHCH2Cl ----(internal SN2)---> epichlorohydrin.  You cannot have epichlorohydrin, (and in effect important drugs) without doing chemistry on the double bond in allyl chloride first!

There is much more to be said, carbon-carbon double bonds are essential in nature and some important chemotherapeutic agents are compounds with double bonds (allenes).

Answer 2

There is an implication for any compound to be an intermediate, that additional chemical modification will be carried out. Alkyl groups are difficult to functionalize further. (I mean in a relative chemical sense. They can be functionalized, but reactivity and selectivity may make many transformations uneconomical.) It would be more useful to have a more reactive group or groups present that can be further manipulated. Double and triple bonds are simply one of many options available.  

Answer 3

because the double bond can be broken and other things connected at the break.