Decarboxylation

Q. Which of the following is incorrect regarding Kolbe’s reaction?

1. The final product is Salicylic acid
2. $C{O}_2$ acts as an electrophile
3. Acidification of phenol leads to formation of main product
4. Phenoxide ion undergoes electrophilic attack

Q. Benzene is heated with a mixture of concentrated $HN{O}_3$ and concentrated $H_{2}S{O}_4$ at ${60}^{o}C.$ The product of this reaction is then treated with $C{l}_2$ in the presence of anhydrous $FeC{l}_3.$ The major product obtained in the final step is

1. 2-chloro-1-nitrobenzene
2. 3-nitrochlorobenzene
3. 4-chloro-1-nitrobenzene
4. equal amounts of (A) and (C)

Q.

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Q. For zero order reaction relation between t 1 by 2 and t 1 by 4?

Q.

What is the conjugate acid of ${\mathrm{NH}}_3$?

Q. Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of $conc.H_{2}S{O}_4$ ?

1. 
2. 
3. 
4. 

Q. CH3CH2CH=CH2. +. HBr

Q.

Assertion: Acetic acid does not undergo a haloform reaction.

Reason: Acetic acid has no alpha hydrogen atoms.

1. The assertion is true, but the Reason is false.

2. Both Assertion and Reason are false.

3. Both Assertion and Reason are true. The reason is the correct explanation of the Assertion.

4. Both Assertion and Reason are true. The reason is not the correct explanation for Assertion.

Q. Which of the following reaction is reffered as 'Bouveault-Blanc reduction?

1. Reduction of acyl halide through $Na/C_2{H}_{5}OH$
2. Reduction of ester through $Na/C_2{H}_{5}OH$
3. Reduction of anhydride through $Na/C_2{H}_{5}OH$
4. Reduction of carbonyl compounds through $Na/C_2{H}_{5}OH$

Q. How to find R and S configuration in lactic acid , explain it with line structure?

Q. Major product is :

1. 
2. 
3. 
4. 

Q. 38.What will be the major product of cross aldol condensation of ethanal and propanal.

Q. When excess of formaldehyde is made to react with acetaldehyde in presence of $Ca(OH{)}_2$, a polyhydroxy compound is formed along with calcium formate. If the ratio of C to O is x:1 in the polyhydroxy compound, what is the value of x?

Q. 0.183 of organic monobasic acid required 15 ml of decinormal sodium hydroxide for complete neutralization. Calculate the molecular Mass of the Acid.

1. 142
2. 124
3. 130
4. 122

Q. The reagent required to convert 2-chloro-2-methyl butane into 2-methyl but -1-ene is

1. $C{H}_3{O}^{-}/C{H}_{3}C{H}_{2}OH$
2. $C{H}_3{O}^{-}/acetone$
3. $(C{H}_3{)}_{3}C-O^{-}$/butyl alcohol
   
4. All of the above

Q.

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2. CRON

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Q. Why doesnt benzylamine react with Br2/H2O?

Q. Sodium salt of benzoic acid on heating with sodalime gives a hydrocarbon '$A$' along with sodium carbonate. The compound '$A$' on treatment with excess of chlorine in the presence of anhydrous $AlC{l}_3$ will give

1. Hexachlorobenzene
2. Hexachlorocyclohexane
3. $2,4,6-$Trichlorophenol
4. $1,4-$Dichlorobenzene

Q. Which of the following compound gives fastest aromatic nucleophilic substitution reaction ?

1. 
2. 
3. 
4. 

Q.

Name an acid that is solid at room temperature.

Q. 3 What is the major product when CH3 - CH(Br) - CH(CH3) - CH3 is treated with Sodium ethoxide?

Q. Compare the rate of aromatic nuleophilic substitution reaction of the following compounds

1. IV > II > III > I
2. III > II > I > IV
3. I > II > III > IV
4. IV > III > II > I

Q. 2, 3-dimethyl butan-2-ol $\stackrel{H_{3}P{O}_4}{\to }$ X

1. 
2. 
3. 
4. 

Q. Select the incorrect statement(s) from the following.

1. Rate of sulphonation for $C_6{H}_6$ is higher than $C_6{D}_6$
2. On treatment of salicylic acid with $B{r}_2/H_{2}O$ (in excess), it results in a dibromo product
3. When $HCOOEt$ is treated with $MeMgBr$ in excess followed by hydrolysis, it will result in the formation of tertiary alcohol
4. 
   Products formed is a pair of enantiomer

Q. Consider the following compounds:

Which of the above compounds reacts with $NaHC{O}_3$ to give $C{O}_2$?

1. I, II and III
2. I and III
3. II and III
4. I and II

Q. How many products will be obtained when propane is subjected to vapour phase nitration?

1. 2
2. 3
3. 4
4. 5

Q. Salicylic acid is treated with bromine under two different conditions

Predict the natue of [X] & [Y] in the above reaction.

1. 
2. 
3. 
4. 

Q.

Schemes $1$ and $2$ describe the conversion of P to Q a

nd R to S, respectively. Scheme $3$ describes the synthesis of T from Q and S. The total number of $\mathrm{Br}$ atoms in a molecule of T is_______

Q. The total number of isomeric mono carboxylic acid (structural isomer), which on decarboxylation give n-pentane is

Q. Identify the major products A and B respectively in the following reactions of phenol:

(B) \( \frac{\text { (i) } CHCl _{3}, NaOH }{\text { (ii) } H _{3} O ^{+}} \) \( \frac{ Br _{2} \text { in } CS _{2}}{273 K } \rightarrow \) (A)