Which of the following compounds is not chiral

Options

A. 1-chloro-2-methyl pentane
B. 2-chloropentane
C. 1-chloropentane
D. 3-chloro-2-methyl pentane

Answer

C

Explanation

To be optically active, compound or structure should possess a chiral or asymmetric carbon atom and C-atom possess four different groups are called chiral carbon.
`underset("1-chloropentane")(H-overset(Cl)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-H)`
`underset("2-chloropentane")(H-overset(H)overset(|)underset(H)underset(|)C-overset(Cl)overset(|)underset(H)underset(|)(C^(**))-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-H`
`underset("1- chloro-2-methylpentane")(H-overset(Cl)overset(|)underset(H)underset(|)C-overset(CH_(3))overset("| ")underset("H ")underset("| ")(C^(**))-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-H)`
`underset("3- chloro-2-methylpentane")(H-overset(Cl)overset(|)underset(H)underset(|)C-overset(CH_(3))overset("| ")underset("H ")underset("| ")(C^(**))-overset(Cl)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-overset(H)overset(|)underset(H)underset(|)C-H)`
`(overset(**)C="asymmetric C - atom")`
Hence, 1- chloropentante is not chiral compound.