Aldehydes and Ketones

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

The final product 'A' in the following reaction sequence
$$\mathrm{CH_3CH_2\text{-}\overset{\displaystyle O}{\overset{\|}{C}}\text{-}CH_3\xrightarrow{HCN}?\xrightarrow[\text{Heat}]{95\%\ H_2SO_4}A}$$
is

Which of the following reactions will yield benzaldehyde as a product ?

(A) Benzoic acid: (i) $\mathrm{SOCl_2}$, Quinoline (ii) $\mathrm{H_2/Pd/BaSO_4}$

(B) Benzyl alcohol: $\mathrm{CrO_3/H_2SO_4}$

(C) Methyl benzoate: (i) $\mathrm{NaBH_4}$ (ii) PCC

(D) Toluene: (i) $\mathrm{CrO_3}$, $\mathrm{(CH_3CO)_2O}$ (ii) $\mathrm{H_3O^+}$, $\Delta$

The correct structure of product 'A' formed in the following reaction.

$$\mathrm{PhCHO+Ph\cdot CHO\xrightarrow[in\ D_2O]{NaOD}A+Ph{-}\overset{O}{\overset{\|}{C}}{-}O^-}\qquad(\mathrm{Ph\ is\ {-}C_6H_5})$$

is

Isobutyraldehyde on reaction with formaldehyde and $\mathrm{K_2CO_3}$ gives compound 'A'. Compound 'A' reacts with KCN and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is

$$\mathrm{C_6H_{12}O_6\xrightarrow{Zymase}A\xrightarrow[\Delta]{NaOI}B+CHI_3}$$

The number of carbon atoms present in the product B is ______.

In the given reaction,

the number of sp$^2$ hybridised carbon(s) in compound 'X' is ______.

In the given reaction, the number of $\pi$ electrons present in the product 'P' is ______.

Choose the reaction which is not possible :

Which among the following will be the major product of the given reaction ?

Which one of the following reactions does not represent correct combination of substrate and product under the given conditions ?

What is the major product of the following reaction ?

$$\mathrm{CH_3{-}CH_2{-}CN\xrightarrow[Ether]{CH_3MgBr}A\xrightarrow{H_3O^+}B\xrightarrow[HCl]{Zn{-}Hg}C}$$

The correct structure of C is

The products formed in the following reaction, A and B are

Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide (PhMgBr) followed by acidic hydrolysis ?

$$\mathrm{Ph{-}C(Ph)(CH_3){-}OH}$$

$[\mathrm{Et\ is\ -C_2H_5}]$

Consider the above reaction and predict the major product.

The structure of A in the given reaction is :

Match List - I with List - II.

Choose the correct answer from the options given below :

In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is ______ $\times10^{-2}$ g. (Nearest integer)

Among the following marked proton of which compound shows lowest $\mathrm pK_a$ value ?