The reaction of an aldehyde with hydroxylamine gives a product which is called

Acetaldehyde reacts with $Cl_2$ (in excess) to give

Which compound can reduce Fehling reagent?

Predict the products of the following reactions:
$(i)$ Cyclopentanone + $NH_2OH \xrightarrow{H^+} ?$
(ii) Cyclohexanone + $2,4-DNP \xrightarrow{H^+} ?$
(iii) $R-CH=CH-CHO + NH_2CONHNH_2 \xrightarrow{H^+} ?$
(iv) Acetophenone + $CH_3CH_2NH_2 \xrightarrow{H^+} ?$

Acetone on addition to methyl magnesium bromide forms a complex,which on decomposition with acid gives $X$ and $Mg(OH)Br$. Which one of the following is $X$?

Which among the following is a possible product during cross aldol condensation between propanal (as electrophile) and butanal (as nucleophile)?