<prompt> Which of the following is a transfatty acid?Oleic acidElaidic acidStearic acidArachidonic acid  <response>: Ans. is b i.e., Elaidic acid There are two types of fatty acids :i Saturatedii Unsaturated Cis - trans isomerism is for unsaturated fatty acids. Stearic acid is a saturated fatty acid No cis-trans isomerism Important unsaturated trans-fatty acid is Elaidic acid trans-9-octadecenoicNumber of C Atoms and Number and Position of common Double BondsFamilyCommon NameSystemic Name Monoenoic acids one double bondQ16:1 ;9o7Palmitoleiccis-9-Hexadecenoic18:1;9o 9OleicQcis-9-Octadecenoic18:1;9o 9Elaidictrans-9-Octadecenoic Dienoic acids two double bonds18:2;9, 12o 6Linoleicall-cisQ-9, 12-Octadecadienoic Trienoic adds three double bonds18:3;6, 9,12o 6g-Linolenicall-cisQ-6,9, 12-Octadecatrienoic18:3;9,12, 15o 3a-LinolenicaIl-cis-9,12, 15-Octadecatrienoic Tetraenoic acids four double bonds20:4; 5, 8, 11, 14o 6Arachidonicall-cis-5, 8, 11, 14-Eicosatetraenoic Pentaenoic acids five double bonds20:5; 5, 8, 11, 14, 17o 3Timnodonicall-cis-5, 8,11,17-Eicosapentaenoic Hexaenoic acids six double bonds22:6; 4, 7,10, 13, 16, 19o 3Cervonicall-cis-4,7,10,13,16,19-Docosahexaenoic 