Which of the following possesses two tertiary alcoholic groups?

Options

A. pinacol
B. Glycerol
C. Propylene glycol
D. Trimethylene glycol

Answer

A

Explanation

Pinacol is
`underset(("tetramethylethylene glycol"))underset(2,3-"Dimethylbutane-2,3-diol")(H_(3)C-overset(CH_(3))overset(|)underset(OH)underset(|)(C)-overset(CH_(3))overset(|)underset(OH)underset(|)(C)-CH_(3))`
It has two tertiary alcoholic groups
Glycols are dihydric alcohols, i.e., compounds containing two hydroxyl groups. They are classifired as `alpha, beta, gamma,`………… glycols, according to the relative positions of the two hydroxyl groups. `alpha` is the `1,2-glycol,beta,1,3,gamma,1,4`..... the commonest glycols are derived are the `alpha-`glycols. the common names of the `alpha-`glycols are derived from the corresponding alkene form which they may be prepared by direct by direct hydroxylation:

`beta-,gamma-`....Glycols are naed as the corresponding polymethylene glycols:
`underset("Trimethylene glycol")(HOCH_(2)CH_(2)CH_(2)OH)`
Glycerel is the only important trihydric alcohol
`underset("Glycerol")(HOCH_(2)CHOHCH_(2)OH)`