CBSE Questions for Class 12 Engineering Chemistry Haloalkanes And Haloarenes Quiz 14 - MCQExams.com

A diabasic organic acid (A) on heating gives (B). The compound (B) on soda lime treatment gives the lowest alkane which can be prepared by Wurtz synthesis. The compound (A) is
The major product of the above reaction is:
1748178_ce91ba8739aa4cb5a539d71bdfcf217d.PNG
Which of the following has highest melting point?
  • $$ BeCl_2 $$
  • $$ MgCl_2 $$
  • $$ CaCl_2 $$
  • $$ BaCl_2 $$
The complex / complex ion, which shows optical activity is :
  • $$[Cr (H_2O)_4Cl_2]^+$$
  • $$[Co(H_2O)_2(NH_3)_2Cl_2]^+$$
  • $$[Co(NH_3)_6]^{3+}$$
  • $$[Co(CN)_5(NC)]$$
Which order is/are correct regarding melting point?
Decreasing order of melting point of compound $$I - IV$$ follows:
1757887_091b8a4b07fe447682454990ca22683a.PNG
  • $$IV > III > II > I$$
  • $$I > II > III > IV$$
  • $$II > III > IV > I$$
  • $$II > IV > III > I$$
The nitration of a compound is due to the 
  • $$NO_2$$
  • $$NO_3$$
  • $$NO$$
  • $$NO_2^+$$
Meso-tartaric acid is
  • optically inactive
  • optically active because of molecular symmetry
  • optically inactive due to external compensation
  • optically active because of asymmetric carbon atom
Which is optically active
  • $$CH_2Cl_2$$
  • $$CHCl_3$$
  • Meso form of tartaric acid
  • Glyceraldehyde
The IUPAC name of:      $$\begin{matrix} { ClH }_{ 2 }C-C=C-{ CH }_{ 2 }Cl \\ |\qquad | \\ Br\qquad Br \end{matrix}$$
  • $$2,3$$ dibromo$$-1,4-$$dichlorobut$$-2-$$ene
  • $$1,4-$$dichloro$$-2,3-$$bromobutane$$-2$$
  • Dichlorodibromobutane
  • Dichlorodibromobutane
The compound $$C_8H_9Cl (A)$$ on treatment with $$KCN$$ followed by hydrolysis gives $$C_9H_{10} O_2 (B) .$$ Ammonium salt of $$B$$ on dry distillation yields $$C$$, which reacts with an alkaline solution of bromine to gives $$C_8H_{11}N. (D).$$ Another compound $$E (C_8H_{10}O)$$ is obtained by the action of nitrous acid on $$D$$ or by the action of aqueous potash on A. E on oxidation gives $$F (C_8H_6O_4)$$ which gives the inner anhydride G on heating. The compound D is reaction with $$CHCl_3+NaOH $$ gives a compound H.

The compound $$A$$ on reaction with $$AgCN$$ gives :
  • Compound H
  • Compound B
  • Compound G
  • Compound D
In the reaction $$CH_3 -Br + 2Na + Br - CH_3 \rightarrow $$, the product called
  • Wurtz reaction
  • Aldol condensation
  • Perth's reaction
  • Levit reaction
The $$IUPAC$$ name of $$n-$$butyl chloride is:
  • $$1-$$chlorobutane
  • $$n-$$chlorobutane
  • tre-butylchloride
  • $$2-$$methylbutane
Dehydrohalogenation of an alkyl halide is
  • An addition reaction
  • A substitution reaction
  • An elimination reaction
  • An oxidation reaction
What would be the product formed when 1-Bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether?
The final product formed when ethyl bromide is treated with an excess of alcoholic KOH is
  • Ethylene
  • Ethane
  • Ethyne
  • Vinyl bromide
A mixture of ethyl iodide and n-propyi iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed is
  • n-butane
  • n-propane
  • n-pentane
  • n-hexane
The reaction , $$CH_3Br + Na \rightarrow Product ,$$ is called
  • Perkin reaction
  • Levit reaction
  • Wurtz reaction
  • Aldol condensation
Which one of the following compounds cannot be prepared by Wurtz reaction?
  • $$CH_4$$
  • $$C_2H_6$$
  • $$C_3H_8$$
  • $$C_4H_{10}$$
The reaction of an aromatic halogen compound with an alkyl halides in presence of sodium and ether is called
  • Wurtz reaction
  • Sandmeyer's reaction
  • Wurtz-fittig reaction
  • Kolbe reaction
Which of the following methods is not suitable for the preparation of $$RX$$?
  • Halogenation of alkane
  • $$ROH$$ and $$PX_3$$
  • $$ROH$$ and $$HX$$
  • Alkene and $$HX$$
Which of the following would be hydrolysed most readily?
  • $$EtBr$$
  • $$MeBr$$
$$C_3H_7Cl \xrightarrow {KOH(alc.)} (A) \xrightarrow {770\ K}{Cl_2 (g)} (X)$$
(X) can be:
  • Vinyl chloride
  • Allyl chloride
  • Ethyl chloride
  • Ethyl iodide
Which method is feasible for the preparation of compound (X) only ?
1769616_8c45fcfba4ea49beb1712f5c9d635ac4.png
The decreasing order of the acidic character of the following is : 
1768987_218a94814d7d43c9a4cfa32933419523.png
  • (I) > (II) > (III) > (IV)
  • (I) > (III) > (II) > (IV)
  • (IV) > (III) > (II) > (I)
  • (IV) > (II) > (III) > (I)
The chemical reaction
$${ { (CH }_{ 3 }) }_{ 3 }CBr\xrightarrow [ { -H }_{ 2 }O,-KBr ]{ alc.KOH } { { (CH }_{ 3 }) }_{ 2 }C={ CH }_{ 2 }$$
is an example of:
  • Nucleophilic subsitution
  • Electrophilic subsitution
  • Free radical subsitution
  • $$\beta$$-Elimination

1771221_b7dd950119da49428175f59584caa07d.png
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect

Which statement is correct about the above reaction?

1770669_c92a3238fd5842e5929e7ae20db0680e.png
  • Both products (B) and (C) are optically active.
  • Both products (B) and (C) are optically inactive.
  • Product (B) is optically inactive but product (C) is optically active.
  • Product (B) is formed by anti-addition but product (C) is formed by syn-addition of $$H_2$$.
The compound (A) is:
1773864_a7a95210e43841f8aad473a5702d4ef1.png
  • None of these
Arrange the compounds in increasing order of rate of reaction towards nucleophilic substitution.
1796929_8f6b689ab4c9423ba9b339e6e834b32a.png
  • $$ (a)< (b)< (c) $$
  • $$ (a)< (c)< (b) $$
  • $$ (c)< (b)< (a) $$
  • $$ (b)< (c)< (a) $$
Number of optically active isomer is / are :

1838454_714feabebcb34123b8782af0c9081f49.PNG
  • $$ 0 $$
  • $$ 1 $$
  • $$ 2 $$
  • $$ 3 $$
Choose the correct option from the following:
  • In the electrophilic substitution of toluene with $$Cl_2 / $$Iron (III) chloride, Iron (III) chloride acts as a Lewis acid.
  • In the reaction of toluene with $$Cl_2/FeCl_3$$, ortho and para isomers are easily separated.
  • Similar reaction with iodine is reversible in nature.
  • All of these
In the question arrange the compounds in increasing order of rate of reaction towards nucleophilic substitution.
1847658_04378502a1434185be74a1641cf333af.png
  • (I) < (II) < (III)
  • (I) < (III) < (II)
  • (III) < (II) < (I)
  • (II) < (III) < (I)
Ethyl alcohol is obtained when ethyl chloride is boiled with 
  • alcoholic KOH
  • aqueous KOH
  • water
  • aqueous $$KMnO_4$$
0:0:1


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