In a match filled by goalkeeper misadventures, Arsenal, on Saturday forced Chelsea to a 2-2 draw at the Stamford Bridge.
Gunners with the result remain second on the table with the same 21 points as Manchester City who are league leader.
Palmer puts Chelsea in front in the first half as he converted the spot kick after VAR check awarded a penalty to the Blues for William Saliba’s handball in the box.
Chelsea increased their fortunes early in the second half when Mikhailo Mudryk’s effort beat Goalkeeper Raya long stretch to double the lead for the hosts.
With some substitutions, Arsenal became more punching upfront and it was goalkeeper Robert Sanchez who gave it all out from a wrong pass and had himself to blame when Declan Rice long range shot beat him off the track in the 77th minutes.
Chelsea finally threw the whole thing away when Leonard Trossard tap in a cross from Bukayo Saka in the 84th minutes to level up for the Gunners.
Eddie Nketiah could have earned the visitors the ultimate points some two minutes later but his effort went a bit wide.