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A hydrocarbon (R) has six membered ring in which there is no unsaturation. Two alkyl groups are atttached to the ring adjacent to each other. One group has 3 carbon atoms with branching at 1st carbon atom of chain and another has 4 carbon atoms. The larger alkyl group has main chain of three carbon atoms of which second carbon is substituted. Correct IUPAC name of compound (R) is

(1) 1-(1-Methylethyl)-2-(1-methylpropyl)cyclohexane

(2) 1-(2-Methylethyl)-2-(1-methylpropyl)cyclohexane

(3) 1-(1-Methylethyl)-2-(2-methylpropyl)cyclohexane

(4) 1-(1-Methylethyl)-2-butylcyclohexane