Which of the following is correct?
(i) `2`-Methylpentane has one isopropyl group.
(ii) `3`-Methylhexane contains only one methyl, one ethyl, and one `n`-propyl group.
(iii) `3`- Ethylpentane is the lowest molecular mass alkane which has ethyl group as the subsitituent.
(iv) `2,3`-Dimethylbutane has two isopropyl groups.

Options

A. (1) (i), (ii),(iii), (iv)
B. (2) (i), (iii),(iv)
C. (3) (i), (ii), (iii)
D. (4) (ii), (iii), (iv)

Answer

A

Explanation

`CH_(3)-underset("2-Methylpentane has one isopropyl group")(underset(CH_(3))underset(|)(CH) -CH_(2)CH_(2)CH_(3))`
`CH_(3)CH_(2)-underset("one ethyl, and one prophyl group")underset("2-Methylhexane has one methyl",)(underset(H)underset(|)overset(CH_(3))overset(|)(CH)-CH_(2)CH_(2)CH_(3))`
`CH_(3)CH_(2)underset("substituent")underset("alkane with ethyl group as")underset("1-Ethylpentane is the simplest",)(overset(C_(2)H_(5))overset(|)(CH)CH_(2)CH_(3))` , `CH_(3)underset("two isopropyl goups")underset("2,3-Dimethylbutane has")(underset(CH_(3))underset(|)(CH)-underset(CH_(3))underset(|)(CH)CH_(3))`