In the reaction sequence $CHCl_3$ $\xrightarrow{Air/hv} x$ $\xrightarrow[Excess]{C_6H_6 / Anhy. AlCl_3} y$,$y$ will be

Consider the following statements. Which of the following reactions can be used to prepare acetophenone?
$I.$ Oxidation of $1$-phenylethanol.
$II.$ Reaction of benzaldehyde with methyl magnesium bromide.
$III.$ Friedel-Crafts acylation of benzene with acetyl chloride.
$IV.$ Distillation of calcium benzoate.
Which of these statements are correct?

Chromyl chloride converts a methyl group to a chromium complex,which on acid hydrolysis gives the corresponding aldehyde. This reaction is called:

The major products $P$ and $Q$ in the following reactions are:
$C_6H_5-CH=NOH$ $\xrightarrow{(i) (CH_3CO)_2O} P$ $\xrightarrow{(i) CH_3MgI, (ii) H_3O^+} Q$

$CH_3COCl \xrightarrow{Pd/BaSO_4, H_2} CH_3CHO + HCl$
The above reaction is called:

Alkyl cyanides,when reacted with a Grignard reagent followed by hydrolysis,yield which of the following products?