Example of trihydric phenol is __________

_______ is an example of trihydric alcohol and _______ is an example of dihydric alcohol.

In phenols-

Phenols are

Phenols.

Fill in the blanks by choosing the appropriate word/words from those given in the bracket: (vacant, square planar, tetrahedral, 64%, crystal, glycol,glycerol, decreases, efficient, increases, 74%, sp^(3)d^(2), sp^(3) ) .......... is an example of trihydric alcohol and........... is an example of dihydric alcohol.

Which of the following is a trihydric phenol ?