Question: 
Maleic anhydride
Maleic anhydride can be prepared by :
Heating trans-but-2-enedioic acid
Heating cis-but-2-enedioic acid
Treating cis-but-2-enedioic acid with alcohol and acid
Treating trans-but-2-enedioic acid with alcohol and acid
Correct Option: , 2
Solution:
Cis but 2-enoic acid
