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CBSE Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 10 - MCQExams.com

A(C7H8O)+Na/Δ No gaseous product
A+Br2/FeBr3C7H7OBr (Two isomers) 
A can be:
 C(CH3)2=C(CH3)2Cl2H2OAOHB
The compound B is:
  • (CH3)2C|OHC|Cl(CH3)2
  • (CH3)2C|OHC|OH(CH3)2
  • none of the above
The compound A and B are :
124157_bbee0e1877a24525bf8b0572e7448693.png
  • None of the above
Identify the structure of A:
  • CH3CH2CH2CH|OHCH3
  • (CH3)2CHCHOHCH3
  • (CH3)3CCH2OH
  • CH3CH2CH|OHCH2CH3
Which of the following reaction is most exothermic?
  • CH3+CH3CH2CH3CH4+CH3CHCH3
Which of the following will be the correct product (P) for the given reaction?
117502_50f9149ed1b14776b738c252fd421d18.png

The addition of mercuric acetate in the presence of water is called oxymercuration. The adduct obtained gives alcohol on reduction with NaBH4 in alkaline medium. This is known as demercuration. Oxymercuration-demercuration allows Markownikoff's addition of H, OH without rearrangement. The net result is the addition of H2O
Based on the above information, find product A in the given reaction.

117531_d9ead791051544a3868b5076e0b73290.png

Give the expected major product of the above reaction.

122697_a9edf726838e49c7a5c020ffbcaf5e04.png
Which of the following reagents should be used to prepare tert-butyl ethyl ether?
  • tert-butyl bromide and sodium ethoxide
  • tert-butyl alcohol and ethyl bromide
  • tert-butyl alcohol and ethanol
  • potassium tert-butoxide and ethyl bromide
Select schemes A, B, C out of the given below.
I. Acid catalysed hydration  
II. Hydroboration oxidation
III. Oxymecruation-demercuration

124170.png
  • I in all cases
  • I, II, III
  • II, III, I
  • III, I, II
What is A ?

205850.png
  • TsOCH2CCH
  • TsO2CH2CCH
  • TsOCH2CCH3
  • none of the above
Which of the following is the correct method for synthesizing methyl-t-butyl ether?
  • (CH3)3CBr+NaOMe
  • (CH3)3CONa+MeBr
  • (CH3)3CBr+HOMe
  • Both A and B
Which of the following are possible products in the above reaction?
137127_901b502cf66348ac801a42f9a1ef3bc9.png
Identify B and C respectively in following conversion.
137079_8382d85466c147da99201637294b98f3.png
  • None of the above
 In given reaction  A is :
146711_e37c675569a34f3280650c9470a92446.png
Which method is useful for the synthesis of ether?
Primary alcohols can be prepared from alkenes by:
  • mercuration and demercuration of alkenes
  • direct hydration of alkenes
  • hydroboration of alkenes
  • all of the above
Reactions I and II are limited mainly to naphthalene compounds. These reactions are called, respectively:
247470_620943915daa431c89d0e79affc2d8dd.png
  • bucherer reaction and its reversal
  • bischler-Napieralski reaction and its reversal
  • birnbaum-Simonini reaction and its reversal
  • borodine-Hunsdiecker reaction and its reversal
Which of the following statements is/are correct?
247363.bmp
  • The compounds (B) is (I).
  • The compounds (B) is (II)
  • The compounds (C) is (I)
  • The compounds (C) is (II)
The compound (A) is:
249321_3644845d0e0043c79481076ed30ec119.png
Which statement is correct for the conversion of ROH to RX by reagents (A) (SOCl2, PBr3 PCl3 Pl3,TsCl) compared to using HX?
  • No rearrangement occurs with predictable stereochemistry by reagents (A)
  • Reasgents (A) are not useful for 3 alcohols, while HX reacts easily with 3 alcohols involving no rearrangement.
  • Reagents (A) must be used in anhydrous conditions because all react vigorously with H2O and they produce harmful gases (SO2,HCl,HBr,andHI)
  • All of the above
Which is the best method for the conversion of (A) pentan3ol to 3bromopentane (B)?

  • (A)HBr(B)
  • None of these
Which of the following reaction is feasible for the preparation of 1-propoxy-2 methyl propane?
  • Williamson's synthesis of (Me2CHCH2ONa+MeCH2CH2Cl)
  • Williamson's synthesis of (Me2CHCH2Cl+MeCH2CH2ONa)
  • Alkoxymercuration-demercuration of (Me2C=CH2+MeCH2CH2OH)
  • Alkoxy mercuration demercuration of propene with Me2CHCH2OH
Give the decreasing order of reactivity of the following compounds with HBr.

249648_2ead6a661a6041dbb0e7cd272bb4f9bd.png
  • III > IV > II > I
  • III > II > IV > I
  • III> II > I > IV
  • II > III > IV > I
Consider the following reaction sequence.
CH2=CH2colddil.KMnO4AexcessPCl5B

The products (A) and (B) are, respectively:
  • CH3CH2OH and CH3CH2Cl
  • CH3CHO and CH3CHCl2
  • CH2OHCH2OH and CH2ClCH2Cl
  • CH2OHCH2OH and CH2OHCH2Cl

251495.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
The product (B) is :

249658_01ff5e1ec5f04b53a5a9a3c7b38af82b.png
  • All
PhCH=CH2ArCO3HCH2Cl2A1.LiAlH4Et2O2.H2OB
The end product (B) is :
  • PhCH(OH)CH3
  • PhCH2CH2COAr
  • PhCH2CH2OH
Which of the following will result in the formation of an ether?
  • (CH3)3CO+Na+CH3CH2Br
  • (CH3)3CBr+C2H5O+Na
  • C6H5ONa+CH3Br
  • C6H5Br+CH3O+Na
Propene is allowed to react with m-chloroperoxybenzoic acid. The product (A) is then reduced with LiAlH4 in dry ether to give (B).

CH3CH=CH2mCPBA A1.LiAlH42.H3O+B

The structure of the product (B) is:
  • CH3CH(OH)CH2OH
  • CH3CH2CH2OH
  • CH3CH(OH)CH3
For the reaction given, what is product (A)?
253318_521e595ebd4148ba974f4ec440b7708a.png
Which statement is correct for the conversion of ROH to RX by reagents (SOCl2,PBr3,PCl3,PI3)  and TsCl compared to using HX?
  • No rearrangement occurs with predictable stereo-chemistry by reagents
  • Reagents are not useful for 3 alcohols, while HX reacts easily with 3 alcohols involving no rearrangement
  • Reagents must be used in anhydrous conditions because all react vigrously with H2O and they produce harmful gases (SO2, HCl, HBr, and HI)
  • All
The product (B) is:

249652_99b8dffffd3140a3aa5294dccd4569db.png
  • all
Consider the reaction:

 C3H7OH+EtOBF4C3H7OEt+EtOEt

Which of the following statements is wrong?
  • The nucleophile in the reaction is C3H7O
  • The nucleophile in the reaction is BF4
  • The leaving group is Et2O
  • SN2 reaction occurs
A compound (X) reacts with thionyl chloride to give a compound (Y). (Y) reacts with Mg to form a Grignard reagent, which is treated with acetone and the product is hydrolysed to give 2-methyl-2- butanol. What are structural formulae of (X) and (Y) ?
  • X = Acetic acid Y = Ethyl Chloride
  • X = Acetaldehyde Y = Ethyl Chloride
  • X = Ethyl Alcohol Y = Ethyl Chloride
  • X = Propyl alcohol Y = Propyl Chloride
Select the incorrect synthesis.
In which of the following solvents, KI has highest solubility? The dielectric constant (ϵ) of each liquid is given in parentheses.
  • C6H6(ϵ=0)
  • (CH3)2CO(ϵ=21)
  • CH3OH(ϵ=32)
  • CCl4(ϵ=0)
For the reaction the major product is:

274431.png
Complete the blanks by identifying X and Y.
399096_eb04222c956244ec8a6cd2961faf5cba.png
  • Ethanal, ethene
  • Ethanol, ethene
  • Ethanal, ethyne
  • Ethanol, ethyne
The boiling point of phenols are higher than the hydrocarbons of comparable masses due to:
  • more polarising power
  • presence of hydrogen bonding
  • resonance stabilisation
  • acidic character
m-Methoxyphenol is a weaker acid than phenol.
  • True
  • False
Correct statement(s) in case of n-butanol and t-butanol is (are):
  • both are having equal solubility in water.
  • t-butanol is more soluble in water than n-butanol.
  • boiling point of t-butanol is lower than n-butanol.
  • boiling point of n-butanol is lower than t-butanol.
Which of the following has lowest boiling point?
  • p-nitrophenol
  • m-nitrophenol
  • o-nitrophenol
  • phenol
Identify the correct sequence of given steps for the conversion of calcium carbide to methyl alcohol.
(a) Reaction with aqueous KOH
(b) Hydrolysis
(c) Reaction with soda lime
(d) Reaction with HaSO4/H2SO4
(e) Reaction with HgSO4
(f) Reaction with PCl5
  • b d e c f a
  • b d c a f e
  • b f d e a c
  • d b c e f a
Ethanol is produced by/from :
  • ethene
  • fermentation of sugars
  • both A and B
  • none of the above
ROHPBr3AMg/Dry etherBHCHOCH+/H2OD

What are A,B,C & D respectively?
  • RBr,RBrMg,RCH2MgBr,RCH2CHO
  • RBr,RMgBr,RCH2OMgBr,RCH2CHO
  • RBr,RMgBr,RCH2OMgBr,RCH2OH
  • RBr,RMgBr,RCH2Br,RCH2OH
Which one of the following is produced when acetone is saturated with HCl gas?
  • Acetone alcohol
  • Phorone
  • Mesityl oxide
  • Benzene
CH3CH2OHACH3CH2ClBCH2=CH2.

 A and B in this sequence of reactions are :
  • KOH(aq) and PCl5
  • PCl5 and KOH(aq)
  • Cl2 and KOH(alc)
  • PCl5 and KOH(alc)
ROHP+I2AHeatingalc. KCNBLiAlH4Na/alcoholCHNO2NaNO2+dil HClD

What are A,B,C & D respectively?
  • RI, RCN, RNH2, RCH2OH
  • RI, RCN, RCH2NH2, RCH2OH
  • RI, RNC, RCH2NH2, RCH2OH
  • RI, RCN, RCH2NO2, RCH2OH
ROHPBr3AMg/Dry etherBGrignard reactionCH2CH2OCH+/H2OD

What are A,B,C and D are respectively?
  • RBr,RMgBr,RCH2OMgBr,RCH2CH2OH
  • RBr,RMgBr,RCH2OCH2MgBr,RCH2CH2OH
  • RBr,RMgBr,RCH2CH2OMgBr,RCH2CH2OH
  • RBr,RMgBr,RCH2CH2OMgBr,RCH2OH
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