Identify the product in the following reaction: $Phenol \xrightarrow{CrO_3} \text{Product}$

Explain why $p-$nitrophenol is more acidic than $o-$nitrophenol?

The correct order for acidity of the following hydroxyl compounds is:
$A. CH_3OH$
$B. (CH_3)_3COH$
$C. C_6H_5OH$
$D. p-CH_3OC_6H_4OH$
$E. p-O_2NC_6H_4OH$
Choose the correct answer from the options given below:

The major product of the following reaction sequence is

Which of the following acids does not have a $-COOH$ group?

Salicylaldehyde on heating with zinc dust gives . . . . . . as the organic product.