what is the product of dehydrohalogenation of (R,R)-2,3-dibromobutane

But-2-yneAs Bromo are attached at the 2nd and 3rd position in the carbon chain of 4 carbon atoms both the bromo atoms are replaced along with the two hydrogen atoms from the carbon chain. This will be done as follows:-We know that order of reactivity of carbon atoms is as follows:-3°>2°>1°In the given carbon chain no 3°carbon atom is given but two 2°carbon atoms are given so two H atoms are replaced from both 2°carbon atoms. So 80% But-2-yne is formed as a major product. Also 10% Buta 1,2 di ene and 10%Buta 1,4 diene are formed as minor products because 1°carbon atom is also reactive