Acetone on treatment with $CH_3MgI$ and on further hydrolysis gives:

Arrange the following carbonyl compounds in decreasing order of their reactivity in nucleophilic addition reaction:
$(i)$ Benzaldehyde
(ii) $p$-Nitrobenzaldehyde
(iii) Acetophenone
(iv) $p$-Methylbenzaldehyde

Which of the following compounds forms lactic acid upon the formation of its cyanohydrin followed by hydrolysis?

Acetaldehyde $(CH_3CHO)$ reacts with:

The product $(P)$ of the below reaction sequence is:

Which of the following organic compounds exhibits positive Fehling test as well as iodoform test?