Three structural isomers A, B, and C of an alkane with the molecular formula C₅H₁₂ undergo photochemical monochlorination. It is observed that isomer A yields 1, isomer B yields 3, and isomer C yields 4 structurally isomeric monochloro products. The correct increasing order of the melting points of these isomers is :

Step-by-step solution

The alkane C₅H₁₂ has three structural isomers: n-pentane, isopentane, and neopentane. Based on the number of structurally isomeric monochloro products formed: Neopentane has all 12 equivalent hydrogens, yielding 1 product. Thus, A is neopentane. n-pentane has 3 sets of equivalent hydrogens, yielding 3 products. Thus, B is n-pentane. Isopentane has 4 sets of equivalent hydrogens, yielding 4 products. Thus, C is isopentane. The melting point of alkanes depends on how well the molecules pack in the solid crystal latti