Reimer Tiemann Reaction

Q. The reaction of phenol with chloroform in the presence of dilute sodium hydroxide introduces which of the following functional group?

1. $-CHC{l}_2$
2. $-CHO$
3. $-C{H}_{2}Cl$
4. $-COOH$

Q.

What is the order of acidic strength in O- Fluoro Phenol, m-Fluoro Phenol and p-Fluoro Phenol ? Please specify whether Ortho effect is considered in o-Fluoro phenol or not.

Q. In the reaction,


The electrophile involved is:

1. Dichloromethyl anion $(CHC{l}_2{)}^{-}$
2. Formyl cation $(CHO{)}^{+}$
3. Dichloromethyl cation $(CHC{l}_2{)}^{+}$
4. Dichlorocarbene $(:CC{l}_2)$

Q.

The reaction of an inorganic Sulphite $\mathrm{X}$ with dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ generates compound $\mathrm{Y}$. Reaction of $\mathrm{Y}$ with $\mathrm{NaOH}$ gives $\mathrm{X}$. Further, the reaction of $\mathrm{X}$ with $\mathrm{Y}$ and water affords compound $\mathrm{Z}$. $\mathrm{Y}$ and $\mathrm{Z}$, respectively, are :

1. ${\mathrm{SO}}_2$and ${\mathrm{NaHSO}}_3$

2. $\mathrm{S}$ and ${\mathrm{Na}}_2{\mathrm{SO}}_3$

3. ${\mathrm{SO}}_2$ and ${\mathrm{Na}}_2{\mathrm{SO}}_3$

4. ${\mathrm{SO}}_3$ and ${\mathrm{NaHSO}}_3$

Q. In the reaction of phenol with $CHC{l}_3$ and aqueous $NaOH$, the electrophile attacking the ring is :

1. $CHC{l}_3$
2. $CHC{l}_2$
3. $:CC{l}_2$
4. $COC{l}_2$

Q.

Define the term brisk effervescence?

Q.

State why concentrated sulphuric acid is not used for drying ammonia gas.

Q. When Grignard reagent reacts with ketone, it yields:

1. $3^{\circ }$ alcohol
2. ethanol
3. $1^{\circ }$ alcohol
4. $2^{\circ }$ alcohol

Q. The correct statement(s) about the following reaction sequence is/are:
$Cumene\left(C_9{H}_{12}\right)\underset{ii)H_3{O}^{+}}{\overset{i)O_2}{\to }}P\stackrel{CHC{l}_3/NaOH}{\to }Q\left(major\right)+R\left(minor\right)$

$Q\underset{PhC{H}_{2}Br}{\overset{NaOH}{\to }}S$

1. R is steam volatile
2. Q gives a dark violet coloration with $1\%$ aqueous $FeC{l}_3$ solution
3. S gives an yellow precipitate with 2, 4-dinitrophenylhydrazine
4. S gives a dark violet coloration with $1\%$ aqueous $FeC{l}_3$ solution

Q. A new carbon-carbon bond formation is possible in:

1. Cannizzaro reaction
2. Friedel-Crafts reaction
3. Clemmensen reduction
4. Reimer-Tiemann reaction

Q.

What happens when Ethene is reacted with water in the presence of Phosphoric acid?

Q. $C{H}_3-O-C{H}_2-Cl\underset{\Delta }{\overset{aq{.}^{\ominus }OH}{\to }}C{H}_3-O-C{H}_2-OH$ Which information below regarding this reaction is applicable?

1. It follows $S_{N}2$ pathway, because it is a primary alkyl chloride
2. A mixed $S_{N}1$ and $S_{N}2$ pathway is followed
3. It follows $S_{N}1$ pathway, because the intermediate carbocation is resonance stabilized
4. $S_{N}1$ pathway is not followed, because the intermediate carbocation is destabilised by -I effect of oxygen.

Q. The rate of dehydrohalogenation of the given compounds follows the order:

1. (iii) > (i) > (ii)
2. (ii) > (iii) > (i)
3. (ii) > (i) > (iii)
4. (iii) > (ii) > (i)

Q.

What happens to a ketone in the base?

Q.

How is Phenol converted to Salicylic acid ?

Q. Predict the product of the aldol condensation reaction.

1. 
2. 
3. 
4. 

Q. Phenol in presence of sodium hydroxide reacts with chloroform to form salicyladehyde. The reaction is known as:

1. Kolbe's reaction
2. Reimer-Tiemann reaction
3. Etard reaction
4. Stephen reaction

Q. Salicylaldehyde is obtained when phenol is heated with $CHC{l}_3$ and aqueous $NaOH$. This reaction is known by which name?

1. Carbyl amine reaction
2. Reimer Tiemann reaction
3. Hoofmann's reaction
4. Kolbe-Schmidt reaction

Q. Why Zn dust is used in the process of ozonolysis?

Q. RCOOAg react with Br2/hot product is?

Q. 46. Among the following four compounds :(b) methyl phenol(d) paranitrophenol, (a) phenol(c) metanitrophenolThe acidity order is:(1) c>d>a> b(3) b>a>c> d(2) c > d > c > b(4) d> c> a> b

Q. 3 Why trichloroethanal cannot give Canizzaro Reaction?

Q.

Among the following compounds:

I) Phenol II) Methylphenol III) m-nitrophenol IV) p-nitrophenol

The acidity order is:

1. IV > III > I > II

2. III > IV > I > II

3. I > IV > III > II

4. II > I > III > IV

Q. Predict the amide substrate for the given Hoffmann bromamide degradartion reaction.

1. 
2. 
3. 
4. 

Q. When phenol reacts with chloroform and an alkali like $NaOH$, the compound formed is salicylaldehyde. If we use carbon tetrachloride in place of chloroform, the product obtained is:

1. cyclohexanol
2. phenolphthalein
3. salicylic acid
4. salicylaldehyde

Q. Arrange the following in increasing acidic strength
Propan-1-ol ; 2, 4, 6-Trinitrophenol ; Nitrophenol ; 3, 5- Dinitrophenol ; Phenol ; 4-Methyl phenol

Q. An aldehyde which undergoes Cannizzaro’s reaction and reduces Schiff’s reagent but does not reduce Fehling’s solution is:

1. $C{H}_{3}CHO$
2. $HCHO$
3. $C_6{H}_{5}CHO$
4. salicylaldehyde

Q. How many of following reagent(s) is correct in options
1.$C{H}_{3}CH=CHCHO\to C{H}_{3}CH=CHCOOH:\text{Ammoniacal}AgN{O}_3$
2.$C{H}_{3}CH=CHCHO\to C{H}_{3}CH=CHC{H}_{2}OH:KMn{O}_4$
3.$R-CHO\to R-C{H}_{2}OH:NaB{H}_4$
4.$C{H}_{3}C{H}_{2}COCl\to C{H}_{3}C{H}_{2}CHO:H_2,Pd/BaS{O}_4$

Q. The reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional groups?

1. $-COOH$
2. $-CHC{l}_2$
3. $-CHO$
4. $-C{H}_{2}Cl$

Q. Phenol with ${CCl}_4$ and $KOH$ gives salicylic acid. The reaction is known as:

1. Reimer - Tiemann reaction
2. Siemlet reaction
3. Rosenmund's reaction
4. Friedel-Craft reaction