Alkanes are saturated organic molecules that contain only carbon and hydrogen atoms connected through single bonds. in the iupac naming system, all alkanes end in the suffix ane and begin with a prefix determined by the number of carbon atoms in the molecule:

Here is the table of prefixes. Alkanes have the general chemical formula CnH2n+2. CH4 where n = 1 is called METhane and this means it has just one carbon atom. The more atoms you add the chemical formula changes. If you have 2 carbon atoms the formula will be C2H2x2+2 id est C2H6 (Ethane).

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The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na