Which of the following is correct decreasing order of rate of reaction with R (Isopropyl, neopentyl, methyl, alkyl, aryl)
(a) Methyl > isoprophl > allyl > aryl > neopentyl
(b) Aryl > allyl > methyl > isopropyl > Neopentyl
(c) Methyl > allyl >isopropyl > neopentyl > aryl
(d) allyl > methyl > isopropyl > neopentyl >aryl
