Read the following road map carefully
Both the ethers obtained by the two routes have opposite but equal optical rotation.
One of the either is obtained as a recemic mixture.
Step II & III both are reaction and both have inversion
Step II has inversion but step III has retention.
Secondary alcohol -
group is attached to secondary carbon.
- wherein
Ethers preparation by alcohol dehydration -
It is nucleophilic bimolecular reaction (SN2) having primary alkyl group.Follows SN1 pathway with secondary or tertiary alcohol.
- wherein
-
Therefore, Option(1) is correct