Two possible stereo-structures of ${\text{CH}}_{\text{3}}\text{CH(OH)COOH}$, which are optically active, are called ______.

The synthesis of alkyl fluorides is best accomplished by

An example of a sigma bonded organometallic compound is ____.

In the following sequence of reaction:

${\text{CH}}_{\text{3}}{\text{ - CH}}_{\text{2}}{\text{-CH}}_{\text{2}}\text{-Br}\stackrel{\text{Alc. KOH}}{\to }\text{(A) }\stackrel{\text{HBr}}{\to }\text{ (B)}\stackrel{\text{aq. KOH}}{\to }\text{ (C)}$

The product $\text{'}\mathrm{C}\text{'}$ is _______.

In the following sequence of reaction$:$

${\mathrm{CH}}_{\mathrm{3}}-{\mathrm{CH}}_{\mathrm{2}}-{\mathrm{CH}}_{\mathrm{2}}-\mathrm{I} \stackrel{\mathrm{Alc}. \mathrm{KOH}}{\to } \left(\mathrm{A}\right) \stackrel{{\mathrm{Br}}_{\mathrm{2}}}{\to } \left(\mathrm{B}\right) \stackrel{{\mathrm{NaNH}}_{\mathrm{2}}/{\mathrm{NH}}_{\mathrm{3}}}{\to } \left(\mathrm{C}\right)$

The product $\text{'}\mathrm{C}\text{'}$ is: