CBSE Questions for Class 12 Engineering Chemistry Haloalkanes And Haloarenes Quiz 13 - MCQExams.com

When alkyl halide is heated with an aqueous solution of silver nitrite,it gives:
  • Nitroalkane only
  • Alkyl nitrite only
  • Alkyl amine
  • None of these
By Wurtz reaction which of the following will give you n - hexane?
  • $$1$$-chloro propane
  • $$2$$-chloro propane
  • Both of these
  • None of these
In chlorobenzene, $$-Cl$$ group attached to benzene acts as activating ortho-para directing due to:
  • (-I) effect = (+) R effect
  • (-I) effect > (+ R) effect
  • (-I) effect < (+ R) effect
  • (-I) effect < (- R) effect

Product $$X$$ is :
1289141_233003d382b146ae8409abcb9c07916e.png
The total number of optically compounds formed in the following reaction is:-

1285752_33ff87095fe5418f893b96473a1d7856.png
  • Four
  • Two
  • Six
  • Zero
The major product of the following reaction is:
$$C_6H_5CH_2-\underset{\,\,\,Br}{\underset{|}{\overset{\,\,CH_3}{\overset{|}{C}}}}-CH_2-CH_3 \xrightarrow[C_2H_5OH]{C_2H_5ONa}$$
  • $$C_6H_5CH_2-\underset{\,\,\,\,\,\,\,OC_2H_5}{\underset{|}{\overset{\,\,\,\,\,CH_3}{\overset{|}{C}}}}-CH_2CH_3$$
  • $$C_6H_5CH=\underset{\,\,\,CH_3}{\underset{|}{C}}-CH_2CH_3$$
  • $$C_6H_5CH_2-\underset{\,\,\,CH_3}{\underset{|}{C}}=CHCH_3$$
  • $$C_6H_5CH_2-\underset{\,\,\,\,\,\,\,\,\,\,CH_2CH_3}{\underset{|}{C}}=CH_2$$

IUPAC name of $$(CH_3)_3CCl$$ is:
  • $$1-butyl chloride $$
  • $$3-chloro butane$$
  • $$2-chloro-2-methylpropane$$
  • $$ 2-butyl chloride$$
The general formula of alkyl halides is:
  • $${ C }_{ n }{ H }_{ 2n }X$$
  • $${ C }_{ n }{ H }_{ 2n+1 }{ X }$$
  • $${ C }_{ n }{ H }_{ 2n }{ X }_{ 2 }$$
  • $${ C }_{ n }{ H }_{ 2n-1 }{ X }$$
Rank the alkyl halides in order of increasing reactivity in $$ E_2 $$ reaction.
  • none
Write the product :

$${C_6}{H_5}-C{H_2}-CH=CH_2+HBr\rightarrow$$
  • $$
    {C_6}{H_5} - CH(Br) - CH = C{H_2} $$
  • $$
    {C_6}{H_5} - C{H_{}} - C{H_2}-CH_2(Br)$$
  • $$C_6H_5-CH_2-CH_1(Br)-CH_3$$
  • none of the above
Which of the following do not form Grignard reagent?
  • $$CH_{3}F$$
  • $$CH_{3}Cl$$
  • $$CH_{3}Br$$
  • $$CH_{3}I$$
When $$Me_{3}C - O - CH_{3}$$ react with excess of $$HI$$ gives $$CH_{3}I$$ and $$Me_{3}CI$$. It follows the type of mechanism is:
  • Only $$S_{N}1$$
  • Only $$S_{N}2$$
  • $$S_{N}2$$ and $$S_{N}1$$
  • $$S_{N}1$$ and $$S_{N}2$$
Acetaldehyde undergoes aldol condensation giving $$\beta$$- hydroxyl carbonyl compound,which on dehydration in basic medium giving $$\alpha,\beta$$ unsaturated carbonyl compound,this dehydration in basic medium is an example for 
  • $$E_1$$ elimination
  • $$E_2$$ elimination
  • $$E_1$$ cb elimination
  • $$E_1$$ or $$E_2$$
$$C_6H_5CCL_5\xrightarrow[Fe]{Cl_2}X$$
In the above reaction X is
  • None of these
In which of the following compound the electrophile attack on o- and p- position :
Identify the false statement 
  • Chloro benzene with chlorine in presence o $$AlCl_3$$ gives o and p- di chloro benzene
  • Benzene with acetyl chloride in presence o $$AlCl_3$$ gives Acetophenone
  • Benzene on onolysis gives three moles of glycol
  • Benzene on chlorination in presence of sunlight forms an addition product which is used as insecticide
Which of the following is not optically active?
  • $$[Co(en)_{3}]^{3+}$$
  • $$[Cr(ox)_{3}]^{3-}$$
  • $$cis[CoCl_{2}(en)_{2}]^{+}$$
  • $$trans-[CoCl_{2}(en)_{2}]^{+}$$

Among the following in which compound $$Br$$ atom has the highest locant number during $$IUPAC$$ nomenclature: 
1339034_1be0aad5ef5f44c0afcb7a41b28b1474.png
  • Only $$(a)$$
  • Only $$(b)$$
  • Only $$(c)$$
  • Both $$(a)$$ and $$(c)$$
The major product of the following reaction is:
1365625_ab7cb370103c4f3884802e9fe4287d14.PNG
$$CH_{3}CH_{2}Cl\overset{NaCN}{\rightarrow}X\overset{Ni/H_{2}}{\rightarrow}Y\xrightarrow[anhydride]{Acetic}Z$$

 Z in the above reaction sequence is 
  • $$CH_{3}CH_{2}CH_{2}NHCOCH_{3}$$
  • $$CH_{3}CH_{2}CH_{2}NH_{2}$$
  • $$CH_{3}CH_{2}CH_{2}CONHCH_{3}$$
  • $$CH_{3}CH_{2}CH_{2}CONHCOCH_{3}$$

What is the IUPAC name of the following compound? 
1367104_a733019d5b1049a98acdedfe33de0e1a.PNG
  • 2-Bromo 3- methylpent-3-ene
  • 4-Bromo-3-methylpent-2-ene
  • 3-Bromo-1,2,dimethylbut-1-ene
  • 3-Bromo-3-methyl-1,2-dimethylprop-1-ene
Which one of the following is an optically active?

The major product of the reaction given below is:
1344037_68180855a0ee49a486a1b0d8cfa41174.PNG
The major product obtained on the monobromination with $$Br_{2}/FeBr_{3}$$ :
1348039_1dbd8f511cb6490093d910b68a572837.GIF
Which is suitable reagent for Wurtz reaction?
  • Na/ether
  • Na/alcohol
  • Zn/ether
  • Zn/alcohol

Which of the following is most reactive toward $$Ag^{\oplus} NO_3^{\ominus}$$ or rate of $$S_{N_1}$$ reaction? 
Which of the following combinations is correctly matched?

What is the $$IUPAC$$ name of the given compound?
1389642_0f689bad87114b728e0e115160ba357b.png
  • $$1-$$chloro cyclohex$$-1-$$ene
  • $$2-$$chloro cyclohex$$-2-$$ene
  • $$3-$$chloro cyclohex$$-1-$$ene
  • $$4-$$chloro cyclohex$$-3-$$ene
 $$+HBr \longrightarrow $$ Product :
1369387_6fc4a57e3ecc4ed39d16225141e53f20.png
Which of the following compounds will give yellow precipitate on shaking with aqueous solution of $$NaOH$$ followed by the addition of $$Ag{NO}_{3}$$ solution?
Find the major product of the following reaction 
1393061_5fde0c52ee894093857df78375be685a.png
Among the following the compounds which can undergo an $$S_N1$$ reaction in an aqueous solution, are: 
1688418_4e64c80bee37444caf93ec69808d0168.png
  • I and IV only
  • II and IV only
  • II and III only
  • II, III and IV only
$$ CH_3Br + Nu^- \longrightarrow CH_3 -Nu + Br^- $$
The decreasing order of the rate of the above reaction with
nucleophile $$ (Nu^- ) $$Ato D is
$$[Nu^-  : (A)PhO^- , (B) AcO^- , (C) HO^- ,(D) CH_3O^- ] $$
  • D>C>A>B
  • D>C>B>A
  • A >B >C>D
  • B >D>C>A
$$S_N1$$ mechanism for the hydrolysos of an alkyl halide involves the formation of intermediate:
  • Free radical
  • Carbocation
  • Carbanion
  • none of these
 1-Bromopropane and 2-bromopropane on treatment with sodium in presence of ether gives: 
  • n-hexane
  • 2,3-dimethylbutane
  • 2-methylpentane
  • a mixture of all these different alkanes '
Secondary butyl chloride on boiling with alcoholic potash gives: 
  • only 1- butene
  • only 2- butene
  • isobutylene
  • a mixture of 1-butene and 2- butene
Which of the following alkyl halide is hydrolysed by $$S_N^1 $$ mechanism? 
  • $$ (CH_3)_3CX $$
  • $$ CH_3CH_2X $$
  • $$ CH_3CH_2CH_2X $$
  • $$ (CH_3)_2CHX $$
Which one of the following compounds is stable? 
  • $$ CH_3CH(OH)_2 $$
  • $$ (CH_3)_2C(OH)_2 $$
  • $$ CCl_3CH(OH)_2 $$
  • None of these
Which of the following is optically active?
  • Butane
  • 4-Methyl heptane
  • 3-Methyl heptane
  • 2-Methyl heptane
Tert. butyl chloride preferably undergoes hydrolysis by: 
  • $$ S_{N^1} $$ mechanism
  • $$ S_{N^2} $$ mechanism
  • Any of (A) and (B)
  • None of these
Which of the following is liquid at room temperature?
  • $$ CH_3I $$
  • $$ CH_3Br $$
  • $$ C_2H_5CI $$
  • $$ CH_3F $$
Which of the following alkyl halides is hydrolysed by $$ S_N 1 $$ mechanism?
  • $$ CH_3 Cl $$
  • $$ CH_3 CH_2 Cl $$
  • $$ CH_3 CH_2 CH_2 Cl $$
  • $$ (CH_3)_3 CCl $$
The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on alcohol is:
  • Anhydrous $$ AlCl_3 $$
  • $$ FeCl_3 $$
  • Anhydrous $$ ZnCl_2 $$
  • $$ Cu $$
 Which of the following will be least reactive in nucleophilic substitution? 
  • $$ CH_3CH_2CH_2Cl $$
  • $$ (CH_3)_3 C-Cl $$
  • $$ CH_3-CHClCH_3 $$
  • $$ H_2C =CHCH_2Cl $$
  • $$ H_2C=CHCl $$
An ethereal solution of alkyl halide is heated with sodium metal. The reaction is known as: 
  • Frankland's reaction
  • Sandmeyer's reaction
  • Wurtz-Fittig reaction
  • Wurtz reaction
The hydrolysis of $$ (CH_3)_3 C- Cl$$ aqueous NaOH follows $$ S_N1 $$ mechanism.
  • True
  • False
$$ (X) +KCN  \longrightarrow CH_3CN \quad  \xrightarrow {2H_2/Ni} CH_3CH_2NH_2 $$ what is (X) ?
  • $$ CH_3CH_2Cl $$
  • $$ CH_3Cl $$
  • $$ CH_3CH_2CH_2Cl $$
  • $$ (CH_3)_2CHCl $$
Which of the following is the least reactive towards
nucleophile? 
  • $$ CH_3CH_2Cl $$
  • $$ CH_3Cl $$
  • $$ H_2C=CH=CH_2Cl $$
  • $$ C_6H_5Cl $$
  • $$ CH_3CH(Cl)CH_3 $$
Identify the correct order of reactivity in electrophilic substitution reaction of the following compounds.
1718044_0aa506ba3adf468797de565d9ad5ab86.PNG
  • I > II > III > IV
  • IV > III > II > I
  • II > I > III > IV
  • II > III > I > IV
Here P is / are:
1748017_15b21359ed2c4ff0a8635d810b244264.png
  • All of these
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