Ans. (i) and (iv)
Explanation:
Longest chain with 10 carbons, so rootword is “dec”.
At 5th carbon (2,2-dimethylpropyl) substituent is present.
And it is also said to be neo-pentyl.
The IUPAC names : 5-(2,2-dimethylpropyl)decane or 5-neopentyldecane.