Name of some compounds are given. Which one is not as per IUPAC system `:`

Options

A. `CH_(3)-CH_(2)-CH_(2)-underset(" "CH_(2)CH_(3))underset(|)(CH)-overset(" "CH_(3))overset(|)(CH)-CH_(2)-CH_(3)` `3-` Methyl `-4-` ethyl heptane
B. `CH_(3)-underset(CH_(3))underset(|)(CH)-underset(OH)underset(|)(CH)-CH_(3)" "3-`Methyl`-2-`butanol
C. `CH_(3)-CH_(2)-underset(CH_(2))underset(||)(C)-underset(CH_(3))underset(|)(CH)-CH_(3)" "2-`Ethyl`-3-`methyl`-`but`-1-`ene
D. `CH_(3)-C-=-underset(CH_(3))underset(|)(CH)-CH_(3)" "4-"Methyl"-2-`pentyne

Answer

A

Explanation

`CH_(3)-CH_(2)-CH_(2)-underset(" "CH_(2)CH_(2))underset(|)(CH)-overset(" "CH_(3))overset(|)(CH)-CH_(2)-CH_(3)" "4-` Ethyl `-3-` methyl`-` heptane