The number of molecules which give the haloform test among the following molecules is $.......$.

In the reaction sequence,
$Cyclohex-2-en-1-one \xrightarrow[(ii) H_2O/H^+]{(i) CH_3MgBr/CuCl} (X)$
Product $(X)$ will be:

Reagents to carry out the above conversion,$P$,$Q$,$R$ respectively are:

$(A) Ph-CH(OH)-CHO \xrightarrow[H_2O]{HO^-} (B)$; $(A)$ and $(B)$ are isomers and isomerization is effectively carried out by a trace of base. Identify $(B)$.

One mole of an organic compound requires $0.5$ mole of oxygen to produce an acid. The compound may be

Among the following,the number of compounds which will give positive iodoform reaction is:
$(a)$ $1-$Phenylbutan$-2-$one
$(b)$ $2-$Methylbutan$-2-$ol
$(c)$ $3-$Methylbutan$-2-$ol
$(d)$ $1-$Phenylethanol
$(e)$ $3,3-$dimethylbutan$-2-$one
$(f)$ $1-$Phenylpropan$-2-$ol