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

In order to obtain diethyl ether from ethanol, the latter is taken in:
  • In equal amount of sulphuric acid
  • In slightly lesser amount of sulphuric acid
  • In excess amount of sulphuric acid
  • In far lesser amount of sulphuric acid
Substrate that readily do not show $$E_1$$ reaction is:
Identify 'Z' in the following reaction series,
$$CH_3CH_2CH_2Br \xrightarrow {aq. NaOH} [X] \xrightarrow[Heat]{Al_2O_3} [Y] \xrightarrow{HOCl} [Z]$$
Find :
1165692_d9ae6121a22a4158b8c8d45980c15d7e.png
Arrange the following compounds in order of decreasing acidity: 
1157042_40f22228f52c460d89b8518e58689853.png
  • I > II > III > IV
  • III > I > II > IV
  • IV > III > I > II
  • II > IV > I > III
How many carbon atom are present in third homologue of methyl ether?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
 
1178246_82fdb025cb4d4a9dbd8b205750631e34.png
What is order of decreasing reactivities of following alcohols towards nucleophilic substitution with HBr ?
Molecule which does not oxidise using PCC?
The major product is:
1208140_013e85a970784c9a982aee26e1c6f421.JPG
Dehydration by conc.$$H_2SO_4$$ is the most difficult in:
Which one of the following will most readily dehydrated in acidic medium?
  • $$1^0-alcohol$$
  • $$2^0-alcohol$$
  • $$3^0-alcohol$$
  • All are equal
In the following reaction X is :-
$$ _{20}Ca^{40}+X \rightarrow _{21}Sc^{43} + _1H^1 $$
  • Electron
  • Positrom
  • alpha particle
  • proton
What is the total number of carbon atoms in $$P_1$$ to $$P_7$$ products ?.
1278058_e37fe21a4d68440898fbce67c27e89aa.png
  • $$91$$
  • $$92$$
  • $$93$$
  • $$94$$

Product C is:
1274539_d756a662de364182ae322893776d39ae.PNG
  • Mixture of 1 and 2
Identify major products $$r_1,r_2 $$ and $$r_3$$ in the given reaction.
1313445_dcddc42f9f654a978de7257537e531b7.PNG
In the reaction sequence,

$$2CH_{3}CHO \xrightarrow []{OH^{-}}A\xrightarrow []{\Delta}B\ ;$$ 

the product $$B$$ is:
  • $$CH_{3}-CH_{2}-CH_{2}-CH_{2}-OH$$
  • $$CH_{3}-CH=CH-CHO$$
  • $$CH_{3}-CH_{2}-CH_{2}-CH_{3}$$
  • $$CH_3-\overset {\displaystyle {\overset {\displaystyle O} {||}}}{C}-CH_3$$
The following change takes place in the reactant?
1297798_f92fdc6180d5411aa3af79c043d643e9.png
  • Rearrangement of $$C_{1} - C_{2}$$ bond
  • Shift of methyl group from $$C_{3}$$
  • Hydride shift from $$C_{2}$$
  • Loss of $$H^{+}$$ from alcoholic group


The IUPAC name of the following compound is:


1300831_6d55006784114bb4bf0ed687745e3daf.PNG
  • $$2$$-ethylbutan-$$2$$-ol
  • $$1$$-ethy-$$1$$-methylpropan-$$1$$-ol
  • $$3$$-methyl pentan-$$3$$-ol
  • diethylethanol
$$(CH_{3})_{2}CHCH_{3} $$   $$\underrightarrow { HN{ O }_{ 2 } } $$   ?
  • $$n-$$butyl alcohol
  • isobutyl alcohol
  • tetiary butyl alcohol
  • secondary butyl alcohol
Which of the following alcohols will dehydrate most rapidly when treated with conc.$$H_2SO_4$$?

Compare the acidic strength of the above compounds.
1317780_ad148fe8d7504c5ea07e3eb4c12d6732.png
  • $$i > ii > iii$$
  • $$ii > iii > i$$
  • $$iii > ii > i$$
  • $$iii > i > ii$$
Which of the following is unsymmetrical ether?
  • $$C_6H_5-O-C_6H_5$$
  • $$CH_3-O-C_2H_5$$
  • $$C_2H_5-C_2H_5$$
  • $$CH_3-O-CH_3$$
For which of the following ethers, Williamson's synthesis is a favourable method of preparation :
  • $$ { H }_{ 3 }C-\overset { \overset { { CH }_{ 3 } }{ | } }{ \underset { \underset { { CH }_{ 3 } }{ | } }{ C } } -O-\overset { \overset { { CH }_{ 3 } }{ | } }{ \underset { \underset { { CH }_{ 3 } }{ | } }{ C } } -CH_{ 3 }$$
  • $$ CH_2=CH-O-CH=CH_2 $$
  • $$ CH_2=CH-CH_2-O-CH_2-CH=CH_2 $$

Choose the compound that shows a precipitate readily on treatment with anhydrous $$ZnCl_2$$ in concentrated hydrochloric acid ?
Which of the following will react most readily with $$HI$$?
  • $$CH_3OH$$
  • $$(CH_3)_3COH$$
  • $$CH_3CH_2OH$$
  • $$(CH_3)_2CHOH$$
Dehydration of following alcohols follows the order:
1347499_2e6b93626cb94cd6a3365d8f8f7f5402.png
  • $$I<II<III<IV$$
  • $$II<III<I<IV$$
  • $$I<II<IV<III$$
  • $$III<I<II<IV$$
The increasing order of boiling point for the following compounds is:
$$(1)$$  $${C_2}{H_5}OH$$
$$(2)$$  $${C_2}{H_5}Cl$$
$$(3)$$  $${C_2}{H_5}C{H_3}$$
$$(4)$$  $${C_2}{H_5}OC{H_3}$$
  • (III)<(IV)<(II)<(I)
  • (IV)<(III)<(I)<(II)
  • (II)<(III)<(IV)<(I)
  • (III)<(II)<(I)<(IV)
Which of the following alcohols can be prepared by direct hydration of the corresponding alkene in presence of 50% sulphuric acid?
  • Butan-1-ol
  • Butan-2-ol
  • 2-Methylpropan -1-ol
  • 2-Methylpropan-2-ol
i- $$1,2$$ dihydroxy benzene
ii- $$1,3$$ dihydroxy benzene
iii- $$1,4$$ dihydroxy benzene
The increasing order of boiling points of the above mentioned alcohols is
  • $$i < ii < iii $$
  • $$ ii < iii < i$$
  • $$iii < ii < i$$
  • $$ii < i < iii$$
How many pi($$\pi $$) electron are there in the following molecule?
1346601_c585aff6cfbf4f5c8fe1a0a6672adec9.png
  • $$4$$
  • $$6$$
  • $$8$$
  • $$10$$
ortho-Nitrophenol is less soluble in water than p- and m-Nitrophenol because: 
  • Melting point of o-nitrophenol is lower than of m- and p- isomers
  • o-Nitrophenol is more volatile in steam than those of m- and p- isomers
  • o- Nitrophenol shows intramolecular H- bonding
  • o- Nitrophenol shows intermolecular H- bonding
Which of the following will undergo dehydration fast?
Among the following compounds which can be dehydrated very easily is-
  • $$CH_{3}-CH_{2}-CH_{2}-CH_{2}-CH_{2}OH$$
  • $$CH_3-CH_2-CH_2-\overset{OH}{\overset{|}{CH}}-CH_3$$
  • $$CH_3-CH_2-\overset{CH_3}{\overset{|}{\underset{OH}{\underset{|}{C}}}}-CH_2-CH_3$$
  • $$CH_3-CH_2-\underset{CH_3}{\underset{|}{CH}}-CH_2-CH_2-OH$$
The order of boiling point of the following compounds is: 

(a) $$CH_{3}CH_{2}OH$$
(b) $$CH_{3}OCH_{3}$$
(c) $$CH_{3}CHO$$
  • $$a < b < c$$
  • $$a > c > b$$
  • $$a > b > c$$
  • $$a < c < b$$
Which of the following is not the product of dehydration of above compound?
1388882_2c75d7ca0e2a4fa9a0545001796d5992.png
Reactivity of given alcohols for acidic dehydration can be explained by ______________
1389995_0a2ac991ed934e219d1a754252ed60d6.png
  • Carbocation stability
  • Product stability
  • Carnbanion rearrangement
  • Acidic strength of alcohols
Which one of the following compounds will be most readily dehydrated?
Identify the dehydration product in the following compound?
1380563_2da9e1e2092e42dea758047ef7e03e13.JPG
  • both (a) and (b)
  • None of these
Which has dipole moment?
  • p-dimethoxybenzene
  • p-dichlorobenzene
  • trans 1,2-dichloroethene
  • $${ BF }_{ 3 }$$
Identify the major product:
1383679_449802308d3c43e8aa3719cc3f45ac52.PNG
The boiling points of the compounds decrease in the order:
I - $$CH_3(CH_2)_3OH$$
II - $$(C_2H_5)_2NH$$
III - $$C_2H_5CONH_2$$
IV - $$(C_2H_5)_2O$$
  • I > II > III > IV
  • III > I > II > IV
  • I > III > II > IV
  • II > III > I > IV
Five compounds with molecular formula $${ C }_{ 4 }{ H }_{ 8 }{ Br }_{ 2 }$$. How many structures of $$X$$ are possible?
1386994_0b2d5486981d4f5c895f17a4735b4de1.JPG
  • 2
  • 3
  • 4
  • 5
Suppose your blaboratory has only $$C{H_3}OH$$ as organic compound and all the inorganic chemicals are available. How will you synthesize the following alcohols?
  • $$C{H_3} - C{H_2} - OH$$
Find the compound '$$Z$$'.
1433336_0f6c88782ed44ee586a7fa9e67159608.PNG
  • $$\rm{ CH_2=CH-CH_2-OH }$$
  • $$\rm{ CH_3-CH(OH)-CH_3 }$$
  • $$\rm{ (CH_3CH_2)CHOH }$$
  • $$\rm{ CH_3CH=CH_2 }$$
Find the structure of product.
1409024_06590a0327bc4515b110b3ca2c56f56a.jpg
The major product "P" obtained in the given reaction is:
1409287_0c0699fbfe324c1ca9438708a10ae4e4.jpg
Among the following the most stable compound is
  • cis-1,2-cyclohexanediol
  • trans-1,2-cyclohexanediol
  • cis-1,3-cyclohexanediol
  • trans-1,3-cyclohexanediol
Which of the following alcohol will have highest rate of dehydration?
In the following reaction the major product is:
1393598_7c89b3a9e8ea46529bfcaf5d7ee051cd.png
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Engineering Chemistry Quiz Questions and Answers