1.

Write the defination of specific rotation.

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Answer :Specific rotation is the number of degrees of rotation observed if a 1-dm (10-cm) tube is used and the COMPOUND has concentration `1gm//mL.`Thus specific rotation `[alpha]` is
`[alpha]_(t)^(lambda) = (THETA)/(t xx C)`
Where, `[alpha]` = Specific rotation;`thetea` = observed angle of rotation (DEGREE)
l = Pathlength (dm);C = concentration (gm/ml)
`lambda` = wavelength (nm);t = temperature `(25^(@)C)`


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