CBSE Questions for Class 12 Engineering Chemistry Haloalkanes And Haloarenes Quiz 9 - MCQExams.com

Which compound is a possible product from addition of $$Br_2$$  to 1- butene?
$$CH_3 - \overset{CH_3}{\overset{|}{C}}H - CH_3 \xrightarrow{Cl_2/hv} \ product$$ 

Major product in the above reaction is :
  • $$CH_3 - \overset{CH_3}{\overset{|}{C}}H - CH_2 - Cl$$
  • $$CH_3 -\underset {Cl} {\overset{CH_3}{\overset{|}{\underset{|}{C}}}} - CH_3$$
  • $$CH_3 - CH_2 - CH_2 - Cl$$
  • $$CH_3 - \underset{Cl} {\underset{|}C}H - CH_2 - CH_3$$
$$\underset{a}{CH_3 }\, - \,\underset{b}{CH_2 }\, - \,\underset{c} {CH_2} \, - \,\underset{d} CH_2 \, - \, F$$
Arrange the hydrogens $$a, b, c, d,$$ in decreasing order of their reactivities towards chlorination:
  • $$a > b > c > d$$
  • $$b > c > d > a$$
  • $$b > c > a > d$$
  • $$c > b > a > d$$
Taking into account the stability of various cycloalkanes and carbocations, as well as the rules governing mechanisms of carbocation rearrangements What is the most likely product of this reaction ?
989506_49e512e34ba849e880df2111add5c9ba.png
The IUPAC name of $$(CH_3)_3C. CH_2CH_2Cl$$ is:
  • $$2, 2$$ - Dimethyl - $$4$$-chloro butane
  • $$1$$ - Chloro - $$3, 3$$ - dimethylbutane
  • $$4$$ - Chloro - $$2, 2$$ - dimethylbutane
  • none of these
Identify the product.
989653_48b5d5780ba742ca8400d22edfd77635.png
Product (B) of the reaction is :
989620_7ede89e8b1004b83a56f61c47e30cadd.png
Compound A, which is the degradation product of the antibiotic vermiculine has following structure?
$$\underset{C_{11}H_{14}O_4}{(A)} \, \xrightarrow[pd/c]{H_2} \, \underset{C_{11}H_{18}O_4}{(B)} \, \xleftarrow{(CH_3)_2S} \, \xleftarrow[CH_2Cl_2]{O_3} \, \underset{C_{11}H_{18}O_2}{(C)} \, .$$ Unknown C is:
989627_633553b3cb714858b3bfdaed315b57ce.png
  • None of these
Product (A) is:
991838_3a6f8894b9d44272a734a11930c85f37.png
In the given pair of alcohol, in which pair second alcohol is more reactive then first towards hydrogen bromide?
  • $$CH_3-\underset{\underset{OH}{|}}{CH}-CH_2-CH_3\, and \, CH_3-CH_2-\underset{\underset{CH_3}{|}}{CH}-CH_2-OH$$
  • $$CH_3-\underset{\underset{OH}{|}}{CH}-CH_2-CH_3\, and \, (CH_3)_2-\underset{\underset{OH}{|}}{C}-CH_2-CH_3$$
Which of the following solvents is most suitable for $$S_N1$$ reaction?
  • Polar protic
  • Polar aprotic
  • Non-polar
  • All of these
In $$E_2$$ elimination some compounds follow Hofmann's rule which means:
992272_ea501c98ae0d4d679f4121b74f8733da.JPG
  • the double bond goes to the most substituted carbon
  • the compound is resistant to elimination
  • no double bond is formed
  • the double bond mainly goes to the less substituted carbon
Compare rate of reaction $$Ag^+NO^-_3$$ or rate of $$S_N1$$ reaction.
The correct choice is:

1035507_c6b28611a0e24e318bbe287bb4b070f6.png
  • I $$>$$ II $$>$$ III
  • II $$>$$ III $$>$$ I
  • II $$>$$ I $$>$$ III
  • I $$>$$ III $$>$$ II
State true or false.
Nature of C-X bond in haloarene is Non-Polar.
  • True
  • False
$$2$$-Methyl propane on monochlorination under photochemical condition give:
  • $$2$$-chloro-$$2$$-methylpropane as major product
  • $$(1:1)$$ mixture of $$1$$-chloro-$$2$$-methylpropane and $$2$$-chloro-$$2$$-methylpropane
  • $$1$$-chloro-$$2$$-methylpropane as a major product
  • $$(1:9)$$ mixture of $$1$$-chloro-$$2$$-methylpropane
The addition of HBr is easiest with:
  • $$CH_2 = CH- Cl$$
  • $$Cl - CH = CH - Cl$$
  • $$CH_3 - CH = CH_2$$
  • $$(CH_3)_2C = CH_2$$
For the reaction, the major product is formed by:
1036903_891a2dede53d4a85a3e9b19c90e2384b.png
  • An E$$1$$ reaction
  • An E$$2$$ reaction
  • $$S_N1$$ reaction
  • $$S_N2$$ reaction
Which of the following reactions is $$S_N1$$ type ?
1035268_1b6e5220c01545f4b90055b211c4dfa4.png
  • Only (i)
  • Only (ii)
  • Both (i) and (ii)
  • None of these
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is:
  • $$CH_3 - CH_3$$
  • $$CH_2 = CH_2$$
  • $$CH \equiv CH$$
  • $$CH_4$$
State true or false.
The nature of C-X bond in $$CH_3-CH_2-CH_2-X$$ is non-polar.
  • True
  • False
$$CH_3CHI_2 \xrightarrow{KCN}\, \xrightarrow[\Delta]{H_2O}$$ ?;
Here the end product would be :
  • 2 - cyanopropionic acid
  • ethane - 1, 1 - dicarboxylic acid
  • 2 - methyl ethanoic acid
  • propionic acid
What are possible product obtained in the following reaction?
$$(CH_3)_3-C-Br\overset{80\% EtOH}{\underset{20\% H_2O}{\rightarrow}}$$.
  • $$(CH_3)_2=CH_2$$ via E$$1$$
  • $$(CH_3)_3-C-OH$$ via $$S_N1$$
  • $$(CH_3)_3C-O-Et$$ via $$S_N1$$
  • $$(CH_3)_2=CH_2$$ via $$E2$$
$$ CH_{ 3 }CH_{ 2 }Cl\quad \xrightarrow [  ]{ NaCN } \times \xrightarrow [  ]{ Ni/H_{ 2 } } Y $$
Y in the above reacting sequence is:
  • $$ CH_3CH_2CH_2NHCOCH_3 $$
  • $$CH_3CH_2CH_2NH_2$$
  • $$CH_3CH_2CH_2CONHCH_3$$
  • $$CH_3CH_2CH_2CONHCOCH_3$$
The correct statement for $$\alpha $$ elimination is?
  • It forms cyclic compounds
  • It forms carbine or substituted carbine
  • Two atoms are removed from $$\alpha $$ and $$\beta$$ positions
  • In $$CHCl_{3};\alpha $$ elimination is not possible
In a set reactions p-nitrotoluene yielded a product $$E$$. The product $$E$$ would be:
1117564_43e64fbc08114b04b59a87c5897932a7.GIF
  • none of these
$$CH_3CH=CH_2 \xrightarrow {Cl-I} P$$, $$P$$ is:
  • $$CH_3-CHI-CH_2Cl$$
  • $$CH_3CHCl-CH_2I$$
  • $$CH_3-ICHCl-CH_2$$
  • $$CH_3-CH_2-ICHCl$$
Reagent which can convert an alkyl amine into alkyl chloride.
  • Tilden reagent (NOCI)
  • Lucas reagent
  • Hisnberg's reagent
  • None
Which of the following reaction will yield, $$2,2$$ - dibromopropare?
  • $$CH_{3}-C\equiv CH+2HBr$$
  • $$CH_{3}-CH=CHBr + 2HBr$$
  • $$CH\equiv CH+2HBr$$
  • $$CH_{3}-CH=CH_{2}+HBr$$
Which of the following has the lowest barrier to rotation about the indicated bond ? 
  • Both A and B
Which of the following react with $$Cl_2$$ and $$Br_2$$ at room temperature and in the absence of diffused sunlight to produce dihalogen derivatives?
  • Cyclobutane
  • Cyclopentane
  • Cyclohexane
  • All of these

Identify the products $$A$$ and $$B$$.
1095869_56533fa28335430489115b931a22ce23.png
  • None of these
Which of the following hydrocarbons is not formed when Wurtz reaction takes place between ethyl iodide and propyl iodide?
  • $$Butane$$
  • $$Propane$$
  • $$Pentane$$
  • $$Hexane$$
The racemic mixture of Alanine ($$CH_8-CH-COOH$$) can be resolved by
$$NH_2$$
1) (+)-2-Butanol
2) (l)-2-Chlorobutanoic acid
3) ()-2-Butanol
4) $$(dil$$ mix)-2-Chlorobutanoic acid
  • 1&2 only
  • 1&3 only
  • 2&4only
  • 3&4only
$${ CH }_{ 2 }={ CH }_{ 2 }+{ Br }_{ 2 }\xrightarrow { NaCl } \quad Products$$. Which of the following product is not formed in the above reaction?
  • $$Br{ CH }_{ 2 }{ CH }_{ 2 }Br$$
  • $$Cl{ CH }_{ 2 }{ CH }_{ 2 }Cl$$
  • $$Br{ CH }_{ 2 }{ CH }_{ 2 }Cl$$
  • All are formed
Which of the following statements regarding the $$S_N1$$ reaction shown by alkyl halide is NOT CORRECT? 
  • The added nucleophile plays no kinetic role in $$S_N1$$ reaction.
  • The $$S_N1$$ reaction involves the inversion of configuration of the optically active substrate
  • The $$S_N1$$ reaction on the chiral starting material ends up with racemization of the product.
  • The more stable the carbocation intermediate the faster the $$S_N1$$ reaction
$$CH_3-CH_3+Cl_2\xrightarrow{hv}$$?
  • $$C_2H_5Cl$$
  • $$Cl_2$$
  • $$CH_2(Cl)-CH_2(Cl)$$
  • All of the above
The product Y is:
1117922_547d70dcc671424b872c7d4dd039101f.png
Above reaction is an example of 1-4 -elimination .Predict the product.
1151140_fde45fb743f242aa93ad27c509450745.PNG
  • $$ C{ H }_{ 3 }-CH=C=C{ H }_{ 2 }$$
  • $$C{ H }_{ 3 }-C=C=C{ H }_{ 3 }$$
  • $$ C{ H }_{ 3 }-C{ H }_{ 2 }=C=C{ H } $$
  • $${ H }_{ 2 }C=CH-CH=C{ H }_{ 2 }$$
Here decreasing order of the rate of Bromination of the following compounds is: 
I. $${ Ph }\overset { \oplus  }{ NM } e_{ 3 }$$
II.$$Ph{ CH }_{ 2 }\overset { \oplus  }{ N } Me_{ 3 }$$
III $$PhMe$$
IV. $$PhNM{ e }_{ 2 }$$
  • (I)>(II)>(III)>(IV)
  • (IV)>(III)>(II)>(I)
  • (III)>(IV)>(I)>(II)
  • (III)>(IV)>(II)>(I)
Alkyl halides can be obtained by all methods excepts?
  • $$CH_{3}-CH_{2}-+HCl\overset{znci_{2}}{\rightarrow}$$
  • $$CH_{2}=CH_CH_{3}-+HBr\rightarrow $$
  • both a and b
  • none of these
Which of the following can undergo nucleophilic substitution reactions?
  • $$CH_3-C\equiv C-H$$
  • $$CH_3-CH_2-CH_3$$
  • $$CH_3-CH=CH_2$$
  • $$CH_3-CH_2-Br$$
Which is more acidic
  • $$CHCl_3$$
  • $$CHI_3$$
  • $$CHBr_3$$
  • $$CH(CN)_3$$
In which of the following reaction, the major product alkene is formed by $$E_1CB$$ mechanism?
  • $$CH_{3} - CH_{2} - CH_{2} - CH_{2} - Br \underset {\triangle}{\xrightarrow {alc. KOH}}$$
  • $$CH_{3} - CH_{2} - \underset {\underset {Br}{|}}{CH} - CH_{3} \underset {\triangle}{\xrightarrow {alc.KOH}}$$
  • $$CH_{3} - CH_{2} - \underset {\underset {F}{|}}{CH} - CH_{3} \underset {\triangle}{\xrightarrow {alc.KOH}}$$
  • $$CH_{3}F \underset {\triangle}{\xrightarrow {alc.KOH}}$$
Identify the major product
1381058_b2da7fe231054cb5a3b699ce40394cbe.png
Consider the above reaction :
The major products formed in this reaction are :

1372334_518e7bbc062542f1a299cef514d92e63.png
  • No reaction
Which among the following compounds is used to decaffeinate coffee?
  • Iodoform
  • Carbon tetrachloride
  • Methylene dichloride
  • Chloroform
Reactivity order for SN1
(i) $$CH_3-\underset{Cl}{\underset{|}{C}H}-CH_2-CH_3$$
(ii) $$Ph-CH_3-\underset{Cl}{\underset{|}{C}H}-CH_3$$
(iii) $$CH_3-\overset{\,\,\,Cl}{\overset{|}{\underset{\,\,\,\,\,\,OCH_3}{\underset{|}{C}}}}-CH_3$$
(iv) $$CH_3-CH_2-CH_2-Cl$$
  • $$i>ii>iii>iv$$
  • $$ii>i>iii>iv$$
  • $$iii>ii>i>iv$$
  • $$iv>iii>ii>i$$
$$ S_n^1 $$ reaction is favoured by:
  • Bulky groups on the carbon atom attached to halogen atom
  • Small groups on the carbon attached to halogen atom.
  • None -polar solvents
  • None of the above
$$CH_3-\overset{CH_3}{\overset{|}{C}H}-CH_2-CH_2-\underset{O}{\underset{||}{C}}-CH_3 \xrightarrow[]{H_2/Pd}$$No. Of stereoisomerism.
  • $$2$$
  • $$4$$
  • $$8$$
  • $$6$$
n-Propyl chloride reacts with sodium metal in dry ether to give:
  • $$CH_{3} - CH_{2} - CH_{2} - CH_{2} - CH_{2} - CH_{3}$$
  • $$CH_{3} - CH_{2} - CH_{3}$$
  • $$CH_{3} - CH_{2} - CH_{2} - CH_{3}$$
  • $$CH_{3} - CH_{2} - CH_{2} - CH_{2} - CH_{2} - CH_{2} - CH_{3}$$
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