Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 46

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Weekly Quiz Competition

Question 1
1 / -0

Predict the correct option for major product.

A
Major product is an alcohol bearing two deuterium atoms per molecule

B
Major product is alcohol bearing one deuterium atom per molecule

C
Major product is an alkane bearing two deuterium atoms per molecule

D
Major product is an alkane bearing one deuterium atom per molecule

Solution
Question 2
1 / -0

Which among the following is corect IUPAC name ?

A
1, 1 - Dimethyl cyclohexan - 3 - ol

B
4 - Methyl bicyclo [3 . 2 . 0] heptane

C
Butane - 1, 2 - dione

D
4 - Ethyl -5 - methyl cyclohexene

Solution
Question 3
1 / -0

What is the functional group in alcohol?

A
$$-OH$$

B
$$-CN$$

C
$$-NC$$

D
-$$NH_2$$

Solution

$$-OH$$ (Hydroxyl group) is the functional group of alcohol. Because, if we add $$-OH$$ to a Methyl group $$(-CH_3)$$, it will be converted to Methyl alcohol $$(CH_3OH)$$
Question 4
1 / -0

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.

A
$${ C }_{ 2 }{ H }_{ 5 }{ OH },C_{ 2 }{ H }_{ 5 }ONa,{ C }_{ 2 }{ H }_{ 5 }Cl$$

B
$${ C }_{ 2 }{ H }_{ 5 }Cl,{ C }_{ 2 }{ H }_{ 6 },{ C }_{ 2 }{ H }_{ 5 }OH$$

C
$${ C }_{ 2 }{ H }_{ 5 }OH,{ C }_{ 2 }{ H }_{ 5 }Cl,{ C }_{ 2 }{ H }_{ 5 }ONa$$

D
$${ C }_{ 2 }{ H }_{ 5 }OH,{ C }_{ 2 }{ H }_{ 6 },{ C }_{ 2 }{ H }_{ 5 }Cl$$

Solution
Question 5
1 / -0

$$3$$-methyl-$$2$$-pentene on reaction with HOCl gives:

A
$$3$$-chloro-$$3$$-methyl pentanol-$$2$$

B
$$2, 3$$-dichloro-$$3$$-methyl pentane

C
$$2$$-chloro-$$3$$-methyl pentanol-$$3$$

D
$$2, 3$$ dimethyl butanol-$$2$$

Solution

The given reaction follows Markownikoff's addition mechanism and add $$OH^-$$ and $$Cl^+$$ across carbon-carbon double bond.
Question 6
1 / -0

In which of the following reactions, the product obtained is tert-butyl methyl ether?

A
$$CH_3OH+HO-CH_2-CH_3\overset{Conc. H_2SO_4}{\rightarrow}$$

B
$$H_3C-\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-Br+CH_3OH\overset{OH^-Na^+}{\rightarrow}$$

C
$$CH_3Br+Na^+O^--\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-CH_3\rightarrow$$

D
$$CH_3-O^-Na^++CH_3-\overset{CH_3}{\overset{|}{\underset{CH_3}{\underset{|}{C}}}}-Br\rightarrow$$

Solution

The product can be obtained by Williamson's synthesis and it involves an $$S_N2$$ pathway.
Thus we can see that Option D is not possible as it will lead to $$E2$$ products.
Therefore, Option C is the correct option.
Question 7
1 / -0

Which of the following is the best reagent to convert cyclohexanol into cyclohexene?

A
Conc. $$HCl$$

B
Conc. $$HBr$$

C
Conc. $${ H }_{ 3 }{ PO }_{ 4 }$$

D
Conc. $$HCl$$ with $${ ZnCl }_{ 2 }$$

Solution

Conc. $${ H }_{ 3 }{ PO }_{ 4 }$$ is a good dehydrating agent which converts an alcohal to an alkene while the other three reagents are nucleophiles which convert alcohals to alkyl halides.
Question 8
1 / -0

$$Ph - C \equiv C - Ph \xrightarrow{Na/NH_3} A \xrightarrow{HOCl/H^+} B$$
$$B$$ is/are:

A

B

C

D
Question 9
1 / -0

Which amoung the following has maximum boiling point?

A
$$CH_{3}-CH_{2}-(CH_{2})-CH_{2}OH$$

B
$$CH_3-CH_2-CH_2 - \underset{OH}{\underset{|}{C}H} - CH_3$$

C
$$CH_3-CH_3 - \underset{OH}{\underset{|}{C}H} - CH_2 - CH_3$$

D
$$CH_3-\!\!\!\overset{\,\,CH_3}{\overset{|}{\underset{\,\,\, OH}{\underset{|}{C}}} \!\!-} \, CH_2 - CH_3$$

Solution

$$CH_3-CH_2-CH_2-CH_2-OH$$
Because it has a linear structure.
Branched alkanes have weaker van der Waals forces because of the smaller area of the contact between the molecules. So, less energy is needed to overcome the intermolecular force.
Question 10
1 / -0

$$1-$$Bromopentane on boiling with alcoholic potassium hydroxide gives:

A
Pentan$$-1-ol$$

B
Pentan$$-2-ol$$

C
pent$$-1-ene$$

D
pent$$-2-ene$$

Solution

When halo alkaline is treated with conc.alcoholic solution of KOH, a molecule of hydrogen halide is eliminated to form alkene. The eliminated hydrogen atom comes from B-carbon atom, so it is called B-elimination reaction. Most highly substituted alkene is major product .