The number of hyperconjugation structures involved to stabilize carbocation formed in the above reaction is _________.

The ratio x/y on completion of the above reaction is __________.

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

The denticity of the ligand present in the Fehling's reagent is ___________.