Nucleophilic Addition at the Carbonyl

Q. Which of the following can be separated by using sodium bisulphite?

1. Acetaldehyde and benzaldehyde
2. Benzophenone and acetaldehyde
3. Acetone and acetaldehyde
4. All of these

Q.

The increasing order of the rate of HCN addition to compounds A-D is:

(A) $HCHO$ (B) $C{H}_{3}COC{H}_3$

(C) $PhCOC{H}_3$ (D) $PhCOPh$

1. $A<B<C<D$
2. $D<B<C<A$
3. $D<C<B<A$
4. $C<D<B<A$

Q.

Assertion (A): Esterification is a process in which a sweet smelling substance is produced.

Reason (R): When esters react with Sodium hydroxide, an alcohol and Sodium salt of Carboxylic acid are obtained.

1. Both A and R are true and R is correct explanation of the Assertion

2. Both A and R are true but R is not the correct explanation of the Assertion

3. A is true but R is false

4. A is false but R is true

Q.

Cyanohydrin of which compound on hydrolysis will give lactic acid?

1. C6H5CHO

2. HCHO

3. CH3CHO
4. CH3-CH2-CHO

Q. Cyanohydrin of which compound gives lactic acid on hydrolysis?

1. Acetone
2. Acetaldehyde
3. Propanal
4. HCHO

Q. What is the major product formed in the reaction?

1. $C{H}_{3}COO{C}_2{H}_5$
2. $C{F}_{3}COO{C}_2{H}_5$
3. Both (a) and (b) are formed in comparable amount
4. Neither (a) nor (b) is formed as major product

Q. Which of the following will not give haloform reaction?

1. Acetone
2. Pentan-2-one
3. Pentan-3-one
4. Butanone

Q.

Bakelite is prepared by the reaction between:

1. Phenol and formaldehyde

2. Urea and formaldehyde

3. Ethylene and glycol

4. Tetramethylene and glycol

Q. The order of reactivity of the following substrates in a nucleophilic addition reaction is:

1. $\left(iv\right)>\left(iii\right)>\left(ii\right)>\left(i\right)$
2. $\left(ii\right)>\left(i\right)>\left(iii\right)>\left(iv\right)$
3. $\left(ii\right)>\left(iv\right)>\left(i\right)>\left(iii\right)$
4. $\left(ii\right)>\left(i\right)>\left(iv\right)>\left(iii\right)$

Q. Which of the following will not give haloform reaction?

1. Acetone
2. Pentan-2-one
3. Pentan-3-one
4. Butanone

Q. Which of the following products is/are not formed in the following reaction?

1. Phthalic acid
2. Propionic acid
3. Acetic acid
4. Salicylic acid

Q. An organic compound neither reacts with neutral ferric chloride solution nor with Fehling's solution. It however, reacts with grignard reagent and gives positive iodoform test. The compound is:

1. 
2. 
3. 
4. 

Q. The reagent with which both acetaldehyde and acetone will react is:

1. Fehling's reagent
2. Grignard reagent
3. Tollens' reagent
4. None of this

Q.
The reactivity of different nucleophiles $(N{H}_2^{-},C{H}_{3}CO{O}^{-},O{H}^{-})$ is in the order:

1. $N{H}_2^{-}<C{H}_{3}CO{O}^{-}<O{H}^{-}$
2. $C{H}_{3}CO{O}^{-}<O{H}^{-}<N{H}_2^{-}$
3. $N{H}_2^{-}<O{H}^{-}<C{H}_{3}CO{O}^{-}$
4. $C{H}_{3}CO{O}^{-}<N{H}_2^{-}<O{H}^{-}$

Q.

Which of the following does not react with sodium bisulphite ?

1. III and IV

2. II and IV

3. I

4. All reacts

Q. Identify Z in the series, $C{H}_{3}CHO\underset{Dil.H_{2}S{O}_4}{\stackrel{Mn{O}_4^{-}}{}}X\stackrel{SOC{l}_2}{\to }Y\underset{Heat}{\stackrel{C{H}_{3}COONa}{\to }}Z:$

1. $C{H}_3.CO.C{H}_{2}COONa$
2. $(C{H}_{3}CO{)}_{2}O$
3. $C{H}_{2}Cl.CO.O.COC{H}_3$
4. $CHC{l}_2.CO.O.COC{H}_3$

Q. In the reaction
Acetaldehyde $\stackrel{O}{\to }A\stackrel{P,C{l}_2}{\to }B\stackrel{KCN}{\to }C\stackrel{H^{+},H_{2}O}{\to }D$ the product ‘D’ is

1. Crotonic acid
2. Lactic acid
3. Malonic acid
4. Tartaric acid

Q.

Nucleophilic addition across the carbonyl will be the best for:

1. Acetaldehyde

2. Acetone

3. Propanal

4. Pentan-2-one

Q. Acetadehyde reacts with thionyl chloride to give (the main product)

1. $C{H}_{3}COCl$
2. $C{H}_{3}CHC{l}_2$
3. $C{H}_{3}C{H}_{2}COCl$
4. $C{H}_{3}C{H}_{2}CHC{l}_2$

Q. Sort the following on the basis of reactivity toward nucleophilic addition reaction.

1. ${\mathrm{CH}}_3\mathrm{CHO}$
2. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}$
3. ${\mathrm{NO}}_2{\mathrm{CH}}_2\mathrm{CHO}$
4. ${\mathrm{ClCH}}_2\mathrm{CHO}$

Q. One mole of an organic compound requires half mole of oxygen to give an acid. The compound may be

1. Alcohol
2. Ketone
3. Aldehyde
4. Ether

Q. The order of reactivity of the following substrates in a nucleophilic addition reaction is:

1. $\left(iv\right)>\left(iii\right)>\left(ii\right)>\left(i\right)$
2. $\left(ii\right)>\left(i\right)>\left(iii\right)>\left(iv\right)$
3. $\left(ii\right)>\left(iv\right)>\left(i\right)>\left(iii\right)$
4. $\left(ii\right)>\left(i\right)>\left(iv\right)>\left(iii\right)$

Q.

Ethyl magnesium iodide reacts with which of the following compound to give 2 - methyl butan - 2 - ol after hydrolysis?

1. Formaldehyde

2. Acetaldehyde

3. Acetone

4. Either acetaldehyde or acetone

Q. Oxidation of a compound ‘X’ gives a product which reacts with phenyl hydrazine but does not give a sliver mirror test. The structure of ‘X’ is

1. $C{H}_{3}CHO$
2. $C{H}_{3}C{H}_{2}OH$
3. $(C{H}_3{)}_{2}CHOH$
4. $C{H}_{3}C{H}_{2}C{H}_{2}OH$

Q. Which of the following compounds has the largest equilibrium constant for the addition of water?

1. 
2. 
3. 
4.