Preparation of Aldehydes and Ketones

Reagent (x) is

Which of the following on heating with aqueous KOH, produces acetaldehyde?

Please explain about Stephen's reaction?
 

${\mathrm{C}}_6{\mathrm{H}}_6+\mathrm{CO}+\mathrm{HCl}\underset{{\mathrm{AlCl}}_3+\mathrm{CuCl}}{\overset{\mathrm{anhydrous}}{\to }}\mathrm{Ph}-\mathrm{CHO}$

The given reaction is:

Find the product A and B in the given reaction :

Hex-2-ene$\underset{{\mathrm{H}}_2{\mathrm{O}}_2}{\overset{{\mathrm{O}}_3}{\to }}\mathrm{A}+\mathrm{B}$

Identify the product A, B and C

$\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}\underset{1\% {\mathrm{HgSO}}_4}{\overset{20\% {\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\left[\mathrm{A}\right]\stackrel{{\mathrm{CrO}}_3}{\to }\left[\mathrm{B}\right]\stackrel{{\mathrm{PCl}}_5}{\to }\left[\mathrm{C}\right]$

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{COOC}}_2{\mathrm{H}}_5\underset{\left(\mathrm{ii}\right){\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right)\mathrm{DiBAL}-\mathrm{H}\left(1\mathrm{eq}\right)}{\to }} \mathrm{A} + \mathrm{B}$

$\mathrm{A} \text{and} \mathrm{B} \text{are}$

Write the structures of the main products of the following reactions:

In the reaction

${\mathrm{CH}}_3\mathrm{CN} + {\mathrm{CH}}_3\mathrm{MgI}\stackrel{{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{\to } \mathrm{B}$

The compound B is

Reaction by which benzaldehyde can not be prepared is

Which of the following reactions will give benzophenone as major product?

(A) Benzoyl chloride $+$ Benzene $+{\mathrm{AlCl}}_3$ (anhyd.)

(B) Benzoyl chloride $+$ Phenylmagnesium bromide (excess)

(C) Benzoyl chloride $+$ Diphenyl cadmium

Consider following reaction, where

(A) The change in the functional group and

(B) The corresponding change in the hybridization from starting to the final product $\mathrm{A}$ and $\mathrm{B}$ are

${\mathrm{CH}}_3\mathrm{C}\equiv \mathrm{N}\underset{\begin{array}{c}\left(\mathrm{i}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}\\ \left(\mathrm{ii}\right) \mathrm{HI}+\mathrm{Red} \mathrm{P}\end{array}}{\overset{\left(\mathrm{i}\right) {\mathrm{SnCl}}_2,\mathrm{HCl}}{\to }}$

The major product in the following reactions is

The major product of the following reaction sequence is

Choose the correct name for the reaction used for the conversion given below.

Toluene on treatment with chromic oxide in acetic anhydride at $273 \mathrm{K}$ to $283 \mathrm{K}$ gives

Major product of following reaction is

$1-$methylcyclohexa$-1, 3-$diene on reductive ozonolysis with $\mathrm{Zn}/{\mathrm{H}}_2\mathrm{O}$ yields products A and B.The total number of ${\mathrm{sp}}^2$hybridized carbons in A and B are