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# The concentration of an organic compound in chloroform is $6.15$g per $100\;mL$ of solution. A portion of this solution in a $5\;cm$ polarimeter tube causes an observed rotation of $-1.2^{\circ}.$ What is the specific rotation of the compound ?

$\begin {array} {1 1} (1)\;+ 12 & \quad (2)\;-3.9^{\circ} \\ (3)\;-39^{\circ} & \quad (4)\;+61.5^{\circ} \end {array}$

(3) $-39^{\circ}$

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