@ shilpi
the name given to the compound 1-butene-3-yne is vinylacetylene ,
ITS CHARECTERISTICS ARE
1- its an organic compound with formula C4H4.
2- its used in polymaer industry and it contains both alkenes and alkynes group .
3- its extremly dengerious gas , that means if it present , more than 30 mole concentration , then they can explode autometically .
4- its also used in chemical processing plant to manufacture c4 hydrocarbon ..
5- its synthesise by hoffmann bromamide elimination reaction with besic compound quaternary ammonium salt .
AND YOUR 2ND QUERY . THERE ARE IN TOTAL 16 SIGMA BOND , IN P4O10 COMPOUND .
HOPE IT CLEARS YOUR DOUBT
ALL THE BEST ..