Which of the following compound is expected to be optically active ?

Options

A. `(CH_(3))_(2)CHCHO`
B. `CH_(3)CH_(2)CH_(2)CHO`
C. `CH_(3)CH_(2)CHBrCHO`
D. `CH_(3)CH_(2)CBr_(2)CHO`

Answer

C

Explanation

`H_(3)C-overset("H ")overset("| ")underset(CH_(3))underset("| ")("C ")-CHO rArr` No optically active C - atom is present.
`CH_(3)-CH_(2)-overset(H)overset("|")underset(H)underset("|")(C )-CHO rArr` No optically active C - atom is present.
`CH_(3)-CH_(2)-overset("Br")overset("| ")underset("Br")underset("| ")("C ")-CHO rArr` No optically active C - atom is present.
`CH_(3)-CH_(2)-overset("Br")overset("| ")underset("H ")underset("| ")(C^(**))-CHO rArr` Presence of optically active C* atom, so the compound is optically active.