Problem 5.1 Classify the following objects as to whether they are chiral(手性) or achiral ) Screw(舌onc Fork (d)Cup (e)Foot (t Ear (g) Shoe(h Spiral staircase(R 旋梯)Problem 5.1 Classify the following objects as to whether they are chiral (手性） or achiral • (a) Screw （非手性） ( b) plain spoon (c ) Fork • (d) Cup (e) Foot (f) Ear • (g) Shoe (h) Spiral staircase（螺 旋梯）