CBSE Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 6 - MCQExams.com

Product of the reaction is :
989649_2df47d24cba440c98f0b336b697bec9b.png
How many moles of $$BH_3$$ are needed to react completely with 2 moles of 1-pentene in hydroboration-oxidation reaction?
  • 2 moles
  • 3 moles
  • 2/3 moles
  • 3/2 moles
Propene $$CH_{3} - CH = CH_{2}$$ can be converted into $$1$$-propanol by oxidation. Indicate which sets of reagents amongst the following is ideal to effect the above conversion?
  • $$KMnO_{4}$$ (alkaline)
  • Osmimum tetroxide $$(OsO_{4}/CH_{2}Cl_{2})$$
  • $$B_{2} H_{6}$$ and alk $$H_{2}O_{2}$$
  • $$O_{3}$$ and $$Zn/H_{2}O$$
Product of the reaction is : 
989548_f3c8b3e162954ac2b64b8e1609684ebc.png
$$CH_3-CH_2-CH_2-CH_2-
\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-CH_2-CH_2-OH\xrightarrow[\Delta]{H^+}\underset{(major)}{(A)}$$
Product (A) is:
  • $$CH_3-CH_2-CH_2-CH_2-\underset{CH_3}{\underset{|}{C}}=CH-CH_3$$
  • $$CH_3-(CH_2)_3-C(CH_3)=C(CH_3)_2$$
  • $$CH_3-CH_2-CH_2-CH_2-\underset{CH_3}{\underset{|}{C}}=CH_2$$
  • $$CH_3-CH_2-\underset{CH_3}{\underset{|}{CH}}-CH_2-\overset{CH_3}{\overset{|}{C}}=CH_2$$
Trans - cyclohexane -1,2- diol can be obtained by the reaction of cyclohexene with :
  • $$KMnO_4$$
  • $$OsO_4$$
  • peroxy formic acid /$$ H_3 O^+$$
  • $$SeO_2$$
Energy profile diagram for dehydration of 2-butanol using conc.$$H_2SO_4$$ is given below.
Product (b) of above reaction is :
990368_30d9f11b185645d083b23ba7d8df33d0.png
  • 1-butene
  • cis-2-butene
  • trans-2-butene
  • iso-butene
Based on above isomers answer the following.
Which isomers on dehydration with conc. $$H_2SO_4$$ give alkene which is capable to show geometrical isomerism?

991889_ad5fce8c290d4ea3842a60f168890e11.png
  • g, h, f
  • b, d, a
  • a, b, c.
  • None of these
Based on above isomers answer the following.
Which isomer on dehydration with conc. $$H_3PO_4$$ undergo maximum rearrangement?

991889_ad5fce8c290d4ea3842a60f168890e11.png
  • a
  • c
  • e
  • b
Which of the following procedures would be best for the preparation of phenyl benzyl ether?
$$C_6H_5OCH_2C_6H_5$$.
  • $$C_6H_5Cl+C_6H_5H_2O^{(-)}Na^{(+)}$$
  • $$C_6H_5O^{(-)}Na^{(+)}+C_6H_5CH_2Cl$$
  • $$2C_6H_5Cl+Na_2O$$
  • $$2C_6H_5MgBr+CH_2O$$
An organic compound having the molecular formula $$C_8H_{10}O$$ on being heated with $$I_2$$ and dilute NaOH gives a yellow precipitate. The expected compound is?
  • $$C_6H_5CH_2CH_2OH$$
Final product $$A$$ is:
992354_2c594cf343d849829eb1fa66c9c3a1f3.png
  • $$CH_{2} = C = CH_{2}$$
Select the best method for the preparation of the following compounds :
993125_fbbd54ccb30f4528947e7d495987edb1.png
  • reaction of cyclohexanone with $$CH_{3}Li$$
  • reaction of $$1-$$methylcyclohexene with $$Hg(OAc)_{2}$$ followed by $$NaBH_{4}$$
  • reaction of cyclohexene with $$BH_{4} ; NaOH/H_{2}O_{2}$$, followed by $$CH_{3}Br$$
  • reaction of cyclohexene with $$MCPBA$$, followed by $$CH_{ 3 }MgBr$$
The structure of the product formed in the reaction given below is :
993234_d3bd9f167c794655941be37e3650b79d.png
$$A$$ & $$B$$ respectively:
992271_dc4fd539f6ce4fe2b6907839e8f05b8e.png
The IUPAC name of the compound is:
996346_fc795ae2bd8342dca3f1853f2183a56e.jpg
  • $$3$$ - Ethylbutane - $$2, 4$$ - diol
  • $$2$$ - Ethylbutane - $$1, 3$$ - diol
  • $$3$$ - Ethylbutane - $$1,3$$ - diol
  • $$2$$ - Ethyl - $$1$$ - methylpropane - $$1, 3$$ - diol
Based on above isomers answer the following.
Which isomer is most reactive towards dehydration by conc. $$H_2SO_4$$?

991889_ad5fce8c290d4ea3842a60f168890e11.png
  • a
  • d
  • f
  • g
$$CH_3  - CH_2  - OH\mathop  \to \limits^{PCl_3 } P\mathop  \to \limits_\Delta ^{alc.KOH} Q$$
'Q' is:
  • $$

    H_2 C = CH_2

    $$
  • $$

    CH_3 - CH_2 - OH

    $$
  • $$

    CH_3 - CH_2 - Cl

    $$
The IUPAC name of the following compound is: cyclopenta-1, 3-dien-1-ol
996393_54a2f156e38c4daa8e9650387403b148.PNG
  • True
  • False
The product of acid catalyzed hydration of $$2-phenylpropene$$ is:
  • $$3-phenyl-2-propanol$$
  • $$1-phenyl-2-propanol$$
  • $$2-phenyl-2-propanol$$
  • $$2-phenyl-1-propanol$$
Predict the correct option for major product.
1027627_8aa673da33f34018ba7f694b59ade668.png
  • Major product is an alcohol bearing two deuterium atoms per molecule
  • Major product is alcohol bearing one deuterium atom per molecule
  • Major product is an alkane bearing two deuterium atoms per molecule
  • Major product is an alkane bearing one deuterium atom per molecule
Which among the following is corect IUPAC name ?
  • 1, 1 - Dimethyl cyclohexan - 3 - ol
  • 4 - Methyl bicyclo [3 . 2 . 0] heptane
  • Butane - 1, 2 - dione
  • 4 - Ethyl -5 - methyl cyclohexene
The IUPAC name of the following compound is: 2 - bromo - 6 - chlorophenol 
996535_f7c7410227c6415891e779993137a2fd.PNG
  • True
  • False
The IUPAC name of the following compound is 2, 4, 6 - tribromophenol.
996537_8e3809b12f0d432eaff4f39fd5dd36fb.PNG
  • True
  • False
The conversation of m- nitrophenol to resorcinol involves _________ respectively.
  • hydrolysis, diasotisation and reduction
  • diasotisation, reduction and hydrolysis
  • hydrolysis, reduction and diazotisation
  • reduction,diazotisation and hydrolysis
Which of the following species show maximum volatility?
  • $$CH_3CH_2OH$$
  • $$CH_3-O-CH_3$$
  • $$H_2O$$
  • $$HF$$
What is its IUPAC name?

$$CH_3-\underset{\displaystyle CH_3}{\underset{|}{CH}}-CH_2-OH$$.
  • 2-methyl propanol
  • 2-ethyl ethanol
  • 3-methyl propanol
  • 3-ethyl ethanol
Given the major product of the following reaction:
1055049_0cedbed10f2b43b0bea62bd5757f429c.png
  • None of these
On boiling with concentrated hydrobromic acid, phenyl ethyl ether will yield:
  • phenol and ethyl bromide
  • phenol and ethane
  • bromobenzene and ethanol
  • bromobenzene and ethane
What is the functional group in alcohol?
  • $$-OH$$
  • $$-CN$$
  • $$-NC$$
  • -$$NH_2$$
The compound A on treatment with Na gives B, and with $${ PCI }_{ 5 }$$ gives C. B and C react together to give diethyl ether. A, B and C are in the order.
  • $${ C }_{ 2 }{ H }_{ 5 }{ OH },C_{ 2 }{ H }_{ 5 }ONa,{ C }_{ 2 }{ H }_{ 5 }Cl$$
  • $${ C }_{ 2 }{ H }_{ 5 }Cl,{ C }_{ 2 }{ H }_{ 6 },{ C }_{ 2 }{ H }_{ 5 }OH$$
  • $${ C }_{ 2 }{ H }_{ 5 }OH,{ C }_{ 2 }{ H }_{ 5 }Cl,{ C }_{ 2 }{ H }_{ 5 }ONa$$
  • $${ C }_{ 2 }{ H }_{ 5 }OH,{ C }_{ 2 }{ H }_{ 6 },{ C }_{ 2 }{ H }_{ 5 }Cl$$
$$3$$-methyl-$$2$$-pentene on reaction with HOCl gives:
  • $$3$$-chloro-$$3$$-methyl pentanol-$$2$$
  • $$2, 3$$-dichloro-$$3$$-methyl pentane
  • $$2$$-chloro-$$3$$-methyl pentanol-$$3$$
  • $$2, 3$$ dimethyl butanol-$$2$$
In which of the following reactions, the product obtained is tert-butyl methyl ether?
  • $$CH_3OH+HO-CH_2-CH_3\overset{Conc. H_2SO_4}{\rightarrow}$$
  • $$H_3C-\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-Br+CH_3OH\overset{OH^-Na^+}{\rightarrow}$$
  • $$CH_3Br+Na^+O^--\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-CH_3\rightarrow$$
  • $$CH_3-O^-Na^++CH_3-\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-Br\rightarrow$$
Which of the following is the best reagent to convert cyclohexanol into cyclohexene?
  • Conc. $$HCl$$
  • Conc. $$HBr$$
  • Conc. $${ H }_{ 3 }{ PO }_{ 4 }$$
  • Conc. $$HCl$$ with $${ ZnCl }_{ 2 }$$
Which of the following is not the product of dehydration of the given?
1070659_c8838895409a490a98158133ff58fb88.png
Find out the total number of 1, 2 shifts in this reaction.
1066174_186419b9c3d44036a6e338c4ac103c7c.PNG
  • 2
  • 3
  • 5
  • 6
$$Ph - C  \equiv C - Ph \xrightarrow{Na/NH_3} A \xrightarrow{HOCl/H^+} B$$
$$B$$ is/are:
$$1-$$Bromopentane on boiling with alcoholic potassium hydroxide gives:
  • Pentan$$-1-ol$$
  • Pentan$$-2-ol$$
  • pent$$-1-ene$$
  • pent$$-2-ene$$
Major product of the given reaction is:
1068649_5460cbc85bc54acfacf2a00b40c01247.png
Which of the following leads to formation of $${ 1 }^{ 0 }$$ alcohol?
  • $${ CH }_{ 3 }-CH={ CH }_{ 2 }\xrightarrow [ { H }^{ + } ]{ { H }_{ 2 }O } $$
  • $${ CH }_{ 3 }-CH={ CH }_{ 2 }\xrightarrow [ Hg{ \left( OAc \right) }_{ 2 }/THF ]{ Na{ BH }_{ 4 }/{ OH }^{ \ominus } } $$
  • $${ CH }_{ 3 }-CH={ CH }_{ 2 }\xrightarrow [ { B }_{ 2 }{ H }_{ 6 }/THF ]{ { H }_{ 2 }{ O }_{ 2 }/{ OH }^{ \ominus } } $$
  • $${ CH }_{ 3 }-C\equiv C-{ CH }_{ 3 }\xrightarrow [ dil.Hg{ SO }_{ 4 } ]{ dil.{ H }_{ 2 }{ SO }_{ 4 } } $$
The IUPAC name of the compound is: 

1087283_af35b6d6664f43fa9da3b695733b24e2.png
  • 3, 4 - dimethyl - 2 - butene - 4 - ol
  • 1, 2 - dimethyl - 2- butenol
  • 3 - methylpent - 3 - en - 2- ol
  • 2, 3 - dimethyl - 3- Pentenol
Which of the following is the best reagent to convert $$1-$$ Methylcyclohexene into $$2-$$ methylcyclohexanol?
  • dil.$$H_2SO_4$$
  • $$Hg(OAc)_2/NaBH_4, H_2O$$
  • $$B_2H_6/H_2O_2, \overset{\ominus}{O}H$$
  • conc. $$H_2SO_4$$
The compound a on treatment with Na gives B, and with $${ PCI }_{ 5 }$$ gives C, B and C react together to give diethyl ether, A, B and C are in the order?
  • $${ C }_{ 2 }{ H }_{ 5 }OH,{ C }_{ 2 }{ H }_{ 6 },{ C }_{ 2 }{ H }_{ 5 }Cl$$
  • $${ C }_{ 2 }{ H }_{ 5 }OH,{ C }_{ 2 }{ H }_{ 5 }CI,{ C }_{ 2 }{ H }_{ 5 }ONa$$
  • $${ C }_{ 2 }{ H }_{ 5 }OH,{ C }_{ 2 }{ H }_{ 5 }ONa,{ C }_{ 2 }{ H }_{ 5 }Cl$$
  • $$C_{ 2 }{ H }_{ 5 }CI,{ C }_{ 2 }{ H }_{ 6 },{ C }_{ 2 }{ H }_{ 5 }OH$$
Which of the following ether is not cleaved by HI even at 525K ?
  • $${ C }_{ 6 }{ H }_{ 5 }-O-{ CH }_{ 3 }$$
  • $${ C }_{ 6 }{ H }_{ 5 }-O-{ C }_{ 6 }{ H }_{ 5 }$$
  • $${ C }_{ 6 }{ H }_{ 5 }-O-{ C }_{ 3 }{ H }_{ 7 }$$
Arrange the following alkanols 1, 2 and 3 in order of their reactivity towards acid catalyzed dehydration.

1087161_608470ade6e949fb9b03bc3d2a7932e4.jpg
  • $$1>2>3$$
  • $$2>1>3$$
  • $$2>3>1$$
  • $$3>2>1$$
$$\underrightarrow { { H }^{ 2 } } $$

1092000_0153a139639c4610ba5216be058b4d82.png
Identify $$Z$$ in the sequence of reaction, $$CH_3CH_2CH = CH_2 \xrightarrow{HBr/H_2O_2} Y \xrightarrow{C_2H_5ON_a} Z$$
  • $$(CH_3)_2CH_2 - O - CH_2CH_3$$
  • $$CH_3(CH_2)_4 - O - CH_3$$
  • $$CH_3CH_2 - CH(CH_3) - O - CH_2CH_3$$
  • $$CH_3 - (CH_2)_3 - O - CH_2CH_3$$
Propene is allowed to react with HBr in the presence of benzoyl peroxide, and the product is subsequently heated with aqueous KOH. The final product obtained is:
  • propan-$$2$$-ol
  • propane-$$1, 2$$- diol
  • propan-$$1$$-ol
  • propane-$$1, 3$$- diol
The final product 'X' is:
1097460_7ee7a70b945d4cdfa3ddec589b2fba05.PNG

What is $$A$$?
1097385_52e4e3dc97864e70939087e9e8713363.png
0:0:1


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