The major product in the following transformation is

Which one of the following on treatment with $50\%$ aqueous sodium hydroxide yields the corresponding alcohol and acid?

The reaction of $1-(\text{aminomethyl})cyclohexan-1-ol$ with $NaNO_2/HCl$ gives $A$. Identify $A$.

Consider the following sequence of reactions:
Ketone $A$ $\xrightarrow[2. H_2O]{1. C_2H_5MgBr} B$ $\xrightarrow[- H_2O]{H_2SO_4, \text{Heat}} C$ $\xrightarrow[2. Zn, H_2O]{1. O_3} \text{Propanone} + \text{Acetaldehyde}$
The ketone $A$ is:

Which of the following are oxidised by $NaOCl$ ?
$I. RCH(OH)CH_3$
$II. RCH_2CH_2-CO-CH_2CH_3$
$III. R-COCH_3$
$IV. CH_3CHO$
$V. (CH_3)_2C=C(CH_3)COCH_3$

The number of nitrogen atoms in a semicarbazone molecule of acetone is $.....$