Which of the following molecules is achiral?

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(D) molecule is achiral if it possesses a plane of symmetry or a center of inversion, or if it lacks a chiral center (a carbon atom bonded to four dif

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$2-$methyl$-2-$butanol

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(D) molecule is achiral if it possesses a plane of symmetry or a center of inversion, or if it lacks a chiral center (a carbon atom bonded to four different groups).$(A)$ $2-$butanol: The $C2$ atom is bonded to $-H, -OH, -CH_3,$ and $-C_2H_5$. Since all four groups are different, it is chiral.$(B)$ $2-$phenyl$-2-$methylbutane: The $C2$ atom is bonded to $-CH_3, -C_2H_5, -C_6H_5,$ and $-H$. Since all four groups are different, it is chiral.$(C)$ $3-$hexanol: The $C3$ atom is bonded to $-H, -OH, -CH_2CH_3,$ and $-CH_2CH_2CH_3$. Since all four groups are different, it is chiral.$(D)$ $2-$methyl$-2-$butanol: The $C2$ atom is bonded to $-OH, -CH_3, -CH_3,$ and $-C_2H_5$. Since two groups $(-CH_3)$ are identical, the molecule is achiral.

Column-$I$	Column-$II$
$A$. Acetaldehyde,vinyl alcohol	$1$. Enantiomers
$B$. Eclipsed and staggered ethane	$2$. Tautomers
$C$. $(+)$$2$-butanol,$(-)$$2$-butanol	$3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine	$4$. Conformational isomers
	$5$. Metamers

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