Addition of Halogen Cyanide

Q.

Give one chemical test to distinguish between the following pairs of compounds.

(i) Methylamine and dimethylamine

(ii) Secondary and tertiary amines

(iii) Ethylamine and aniline

(iv) Aniline and benzylamine

(v) Aniline and N-methylaniline.

Q.

Assertion: Sodium chloride is added to precipitate soap after saponification.

Reason: Hydrolysis of esters of long-chain fatty acids by alkali produces soap in colloidal form.

1. Assertion is correct statement reason is wrong statement
2. Assertion and reason both are correct, and reason explains the assertion
3. Assertion is wrong statement reason is correct statement
4. Assertion and reason both are correct statement, but reason does not explain assertion
5. Both assertion and reason are wrong statements

Q.

Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene.

Q. Benzaldehyde can be obtained from benzal chloride. Write reactions for obtaining benzal chloride and then benzaldehyde from it.

Q. Which is the most suitable reagent for the following conversion?

1. $Zn-Hg+HCl$
2. $I_2+NaOH$
3. Fehling's reagent
4. Tollen's reagent

Q. Consider the reaction:
$RCHO+N{H}_{2}N{H}_2\to RCH=N-N{H}_2$
What sort of reaction is it?

1. Electrophilic addition-elimination reaction
2. Free radical addition-elimination reaction
3. Electrophilic substitution-elimination reaction
4. Nucleophilic addition-elimination reaction

Q. Nitrobenzene on reacting with Zn and $N{H}_{4}Cl$ gives compound 'A' which shows positive tollens test. Predict the compound 'A'.

1. Phenylhydroxylamine​
2. p-Aminophenol​
3. Aniline
4. Benzamide

Q. What will be the product obtained as a result of the following reaction and why?

Q. What is the necessary condition for the preparation of metaphosphoric acid by reaction of phosphorus acid with $B{r}_2$​?

1. Simple heating
2. Heating in a sealed tube
3. Inert atmosphere
4. None of these

Q. How will you convert butan-2-one to propanoic acid?

1. Tollen's reagent
2. Fehling's solution
3. $$I_2/NaOH/H^{+}$$
4. $$NaI/NaOH/H^{+}$$

Q. Ethylene is converted to X on passing through a mixture of an acidified aqueous solution of palladium chloride and cupric chloride. Which of the following reagents readily take part in addition reaction with X

1. HCN
2. HCl
3. HBr
4. $B{r}_2$

Q. Which of the following is(are) example(s) of nucleophilic addition reaction in case of acetylene

1. Addition of $AsC{l}_3$
2. Addition of water

3. Addition of HCN

4. All

Q. A chemical A is used for the preparation of washing soda to recover ammonia. When
$C{O}_2$ is
bubbled through an aqueous
solution of ${}^{\prime }{A}^{\prime },$ the solution turns
milky. It is used in white washing due
to disinfectant nature. What is the
chemical formula of ${}^{\prime }{A}^{\prime },$?

1. $CaC{O}_3$
2. $Ca(HCO3{)}_2$
3. $CaO$
4. $Ca(OH{)}_2$

Q. Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.

Q. Identify the product the given reaction.
$\text{Acetyl chloride}\underset{H_{2}O/O{H}^{-}}{\overset{H_3{O}^{+}}{\to }}P$

1. Acetaldehyde
2. Acetic acid
3. Formic acid
4. Formaldehyde

Q. The reaction between chlorobenzene and chloral in the presence of concentrated sulphuric acid produces

1. Chloropicrin
2. Gammexane
3. Benzene hexachloride
4. p , p - dichloro diphenyl trichloro ethane

Q. Reaction of $C_6{H}_{5}C{H}_{2}Br$ with aqueous sodium hydroxide follows

1. $S_{N}1$ mechanism
2. $S_{N}2$ mechanism
3. Any of the above two depending upon the temperature of reaction
4. saytzeff rule

Q. Assertion (A) : $C_2{H}_{5}Cl$ gives ethyl benzene with benzene in presence of anhydrous aluminium chloride.
Reason (R) : Anhydrous aluminium chloride acts as Lewis acid and generates ethyl carbonium ion electrophile.

1. Both A and R are true and R is not the correct explanation to A
2. Both A and R are true and R is the correct explanation to A
3. A is true but R is false
4. A is false but R is true

Q. Aniline is not the major product in one of the following reactions. Identify that reaction.

1. $C_6{H}_{5}OH+{NH}_3\underset{{300}^{0}C}{\overset{{ZnCl}_2}{\to }}$
2. $C_6{H}_5{NO}_2+ZnPowder\stackrel{alcoholicKOH}{\to }$
3. $C_6{H}_5{NO}_2+Fe+H_{2}O\stackrel{HCl}{\to }$
4. $C_6{H}_{5}Cl+{NH}_3\underset{{Cu}_{2}O}{\overset{{200}^{0}C}{\to }}$

Q. What is meant by Hemiacetal? Give an example of reaction(with mechanism) showing its formation.

Q.

Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene.

Q. Which of the following haloforms would result if iodine were used as the halogen in the haloform reaction?

1. $C{H}_2{I}_2$
2. $C{H}_{3}I$
3. $C{I}_4$
4. $CH{I}_3$

Q.

Poisonous gas Lewissite is obtained by the reaction of

1. 

2. 

3. 

4. 

Q. The formation of cyanohydrin from a ketone is an example of :

1. Nucleophilic substitution
2. Nucleophilic addition
3. Electrophilic addition
4. Electrophilic substitution

Q. Ethylene is converted to X on passing through a mixture of an acidified aqueous solution of palladium chloride and cupric chloride. Which of the following reagents readily take part in addition reaction with X

1. $B{r}_2$
2. HBr
3. HCl
4. HCN

Q. How are reactions of aldehydes and nucleophiles fundamentally different than the reaction between acyl chlorides and nucleophiles?

1. Aldehyde do not form tetrahedral intermediate with nucleophile.
2. Acyl chloride readily forms enol tautomer.
3. Aldehydes are readily oxidized by nucleophile to carboxylic acid.
4. Acyl chloride has a leaving group $C{l}^{-}$ whereas aldehyde does not.

Q. Which of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?

1. ${CH}_3{NH}_2$
2. ${\left(C_6{H}_5\right)}_{2}NH$
3. ${\left({CH}_3\right)}_{3}N$
4. $C_6{H}_5{NHC}_6{H}_5$

Q.

Which one of the following represents saponification reaction.

1. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\stackrel{\mathrm{alkaline}{\mathrm{KMnO}}_4}{\to }{\mathrm{CH}}_3\mathrm{COOH}$

2. $2{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}+2\mathrm{Na}\to 2{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COONa}+{\mathrm{H}}_2$

3. ${\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5+\mathrm{NaOH}\to {\mathrm{CH}}_3\mathrm{COONa}+{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

4. ${\mathrm{CH}}_3\mathrm{COONa}+\mathrm{NaOH}\stackrel{\mathrm{CaO}}{\to }{\mathrm{CH}}_4+{\mathrm{Na}}_2{\mathrm{CO}}_3$