The IUPAC name of CH3- C(CH3)OH - CH2 - CH(CH3)CH3 is A) 2, 4-Dimethyl pentan-2-ol B) 2, 4-Dimentylpentan-4-ol C) 2,2-Dimethylpentan-3-ol D) 2,2-Dimethylbutanol plzz...explain how is it coming???

the correct option is A)
reason:
while naming an carbon compound the first step is to take the longest chain and then number each carbon atom.while numbering we must take care to number it in such a fashion so that the functional group carring compound gets the least number .THE  ABOVE GIVEN COMPOUND is numered as
            OH
             |
¹CH₃-²C-³CH₂-⁴CH-⁵CH₃     
             |                |
            CH₃      CH3
so that the functional group OH is given the lest number ;2
the longest chain has 5 carbon atoms so its IUPAC name contians the word pent and as it only has single bonds it is pentan .asit contains OH group it becomes pentanol ;but we need to specify the position of the OH group .it is present in the second carbon atom .so the compound becomes pentan-2-ol.but it also has two alkyl groups called methyl so the compound becomes methylpentan-2-ol. but as it has two methyl groups it is made to be dimethylpentan-2-ol. as before it is neceessary to specify the position of the group
so the compound becomes 2,4-dimethylpentan-2-ol.