Nucleophilic Addition at the Carbonyl

Q.

CH₃CHO and C₆H₅CH₂CHO can be distinguished chemically by:

1. Benedict test

2. Iodoform test

3. Tollens reagent test

4. Fehling solution test

Q.

The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is: Propanal, Benzaldehyde, Propanone, Butanone

1. Benzaldehyde < Propanal < Propanone < Butanone

2. Propanal < Propanone < Butanone < Benzaldehyde

3. Butanone < Propanone < Benzaldehyde < Propanal

4. Benzaldehyde < Butanone < Propanone < Propanal

Q. How to calculate the n factor of HCL, HNO3 and H3PO4?

Q. 60. Consider the half-cell reduction reaction Mn2+ 2e- Mn, Eo1.18 V Mn2+ Mn3+ + e-, Eo =-1.51 V The Eo for the reaction 3 Mn2 Mn 2 Mn3+, and possibility of the forward reaction are, respectively (1)-2.69 V and no (3) +0.33 V and yes (4) +2.69 V and no (2) -4.18 V and yes

Q.

Trichloroacetaldehyde ccl3cho reacts with chlorobenzene in presence of sulphuric acid

Q. Which has the highest pH ? a) CH3COOK b) Na2CO3 c) NH4Cl d) NaNO3

Q.

${\mathrm{CH}}_2={\mathrm{CH}}_2+{\mathrm{H}}_2\stackrel{\mathrm{Ni}}{\to }{\mathrm{CH}}_3-{\mathrm{CH}}_3$ is an addition reaction.

Complete the following reaction: $\mathrm{CH}\equiv \mathrm{CH}+{\mathrm{H}}_2\stackrel{\mathrm{Ni}}{\to }$?

Q.

What is a Friedel Crafts reaction?

Q.

An Organic Compound With The Molecular Formula Propiophenone (${\mathrm{C}}_9{\mathrm{H}}_{10}\mathrm{O}$) Forms $2,4-\mathrm{DNP}$ Derivative, Reduces Tollens Reagent And Undergoes Cannizzaro Reaction. On Vigorous Oxidation, It Gives$1,2-$benzenedicarboxylic Acid. Identify The Compound.

Q. The acylation of salicylic acid with acetic anhydride gives:

1. Aspirin
2. Salicylaldehyde
3. Benzaldehyde
4. Benzoic acid

Q.

The smallest ketone and its next homologue are reacted with NH2OH to form oxime. What will be the result?

1. Two oximes are optically active
2. Two different oximes are formed
3. Three different oximes are formed
4. All oximes are optically active

Q.

Why is Tertiary Alcohol more Reactive?

Q. Benzaldehyde reacts with acetic acid anhydride in presence of sodium acetate at 180°c then the product formed is

Q.

Which of the following does not react with sodium bisulphite ?

1. I

2. III and IV

3. II and IV

4. All reacts

Q. Identify the position where electrophilic aromatic substitution (EAS) is most favourable.

1. A
2. B
3. C
4. Both A and C

Q.

The pH of 0.002M NaOH solution is nearly

A)2.71. B)6.96 C)7.04. D)11.30

Q. For carbylamine reaction, we need hot alcoholic KOH and

1. any primary amine and chloroform
2. chloroform and silver powder
3. a primary amine and an alkyl halide
4. a monoalkylamine and trichloromethane

Q. Consider the following aldol condensation reaction $C{H}_{3}CHO\underset{\Delta }{\overset{\left(i\right)Dil.NaOH,5^{o}C}{\to }}C{H}_{3}CH=CHCHO$
The nucleophile is:

1. $\stackrel{-}{C}{H}_{2}CHO$
2. $C{H}_2=CH{O}^{-}$
3. $C{H}_2=CHOH$
4. None of the above

Q.

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

1. MeCOCl
2. MeCOOMe
3. MeCHO
4. MeCOOCOMe

Q.

Glucose, on reduction with Na/Hg and water, gives-

1. sorbitol

2. fructose

3. saccharic acid

4. gluconic 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.

Match the compounds/ions in Column I with their properties/reactions in Column II

$\begin{array}{cc}ColumnI& ColumnII\\ 1.\text{Benzaldehyde}& \text{p. gives precipitate with 2, 4-dinitrophenylhydrazine}\\ 2.\text{Propyne}& \text{q. gives precipitate with}AgN{O}_3\\ 3.C{N}^{-}& \text{r. is a nucleophile}\\ 4.I^{-}& \text{s. is involved in cyanohydrin formation}\end{array}$

1. 1. - p, q, r, s; 2 - q, r, s; 3 - r, s; 4 - r

2. 1. - p, q, s; 2 - q, r; 3 - q, r, s; 4 - q, r

3. 1. - p, q; 2 - q; 3 - r, s; 4 - r

4. 1. - p, r, s; 2 - q, r; 3 - q, r, s; 4 - r

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.

The major product H given in the reaction sequence is:

1. 

2. 
   

3. 

4. 

Q. The nucleophilic addition at the carbonyl carbon changes its hybridization fromto

1. $sp$
2. $s{p}^2$
3. $s{p}^3$
4. $s{p}^{3}d$

Q. 26. why doesnt haloarenes undergo nucleophilic substitution reactions?

Q.

What is the common name of 2-methyl-propanal?

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

Q. The number of substitution products formed when metabromo anisole is treated with $KN{H}_2/N{H}_3$, is:

Q.

Which is more reactive Benzaldehyde or Propanal?