1.

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

Answer»

`(CH_(3))_(2)CHCHO`
`CH_(3)CH_(2)CH_(2)CHO`
`CH_(3)CH_(2)CHBrCHO`
`CH_(3)CH_(2)CBr_(2)CHO`

SOLUTION :`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.


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