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#### Hydroxy Compounds and Ethers Model Question Paper

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
14 x 1 = 14
1. Which one of the following is the strongest acid

(a)

2 - nitrophenol

(b)

4 – chlorophenol

(c)

4– nitrophenol

(d)

3 – nitrophenol

2. (CH3)3-C-CH(OH) CH3 $\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow }$X (major product)

(a)

(CH3)3 CCH = CH2

(b)

(CH3)2C = C (CH3)2

(c)

CH2= C(CH3)CH2-CH2- CH3

(d)

CH2= C (CH3) - CH2- CH2- CH3

3. Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction
Reason : In the case of phenol, the intermediate arenium ion is more stabilized by resonance

(a)

if both assertion and reason are true and reason is the correct explanation of assertion.

(b)

if both assertion and reason are true but reason is not the correct explanation of assertion.

(c)

assertion is true but reason is false

(d)

both assertion and reason are false.

4. One mole of an organic compound (A) with the formula C3H8O reacts completely with two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound (A) is

(a)

propan – 2-ol

(b)

propan -1-ol

(c)

ethoxy ethane

(d)

methoxy ehane

5. Pick out the odd one among the following

(a)

CH3CHOHCH3

(b)

${ CH }_{ 3 }{ CH }_{ 2 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -OH$

(c)

(CH3)3C-OH

(d)

C6H5CHOHC2H5

6. The above reaction is called

(a)

Gattermann reaction

(b)

Williamson ether synthesis

(c)

Swern's reaction

(d)

Riemer tiemann reaction

7. In the sequence of reactions Identify 'C'.

(a)

(b)

(c)

(d)

8. Predict the structure of propane-1,2 diol

(a)

CH2 (OH) - CH2CH2OH

(b)

HOCH2 - CH2OH

(c)

CH3CH (OH) CH2OH

(d)

None of these

9. Which of the following has an offensive odour?

(a)

Phenol

(b)

Benzy lalcohol

(c)

Acrolein

(d)

Benzyl benzoate

10. Lower alcohols like ethanol and methanol are miscible in water due to _______

(a)

their acidic character

(b)

vanderwaals force of attraction

(c)

dipole-dipole inter action

(d)

inter molecular hydrogen bonding

11. CH2=CH2+H2 The above reaction is _______

(a)

Lucas test

(b)

Saponification

(c)

Victor Meyer's test

(d)

hydroxylation

12. In the following sequence of reaction, the end product 'B' is ___________

(a)

C6H5N2CI

(b)

(c)

(d)

C6H5OH

13. Identify the major product in the given reaction

(a)

(b)

(c)

(d)

14. Intermolecular hydrogen bonds are not _______ present in

(a)

CH3 COOH

(b)

C2H5OC2H5

(c)

CH3CH2OH

(d)

C2H5NH2

15. 1 x 1 = 1
16. (a) Diethylether with chlorine in presence of sunlight forms (C2Cl5)2O.
(b) The formula of diethyl oxonium chloride is (C2H2)2-O+Cl-.
(c) In anisole oxygen is strongly bonded to benzene ring.
(d) Ether is used as solvent for Grignard reagent

()

The formula of diethyl oxonium chloride is (C2H2)2-O+Cl-.

17. 2 x 2 = 4
18. In the following question a statement of assertion (A) is given and a corresponding statement of reason (R) is given just below it. Mark the correct statement as.
Assertion (A): Ethanol is a weaker acid than phenol.
Reason (R): Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
a) (A) and (R) are true and (R) is the correct explanation of (A)
b) Both (A) and (R) are true but (R) does not explain (A)
c) (A) is true but (R) is false
d) Both (A) and (R) are false

19. In the following question a statement of assertion (A) is given and a corresponding statement of reason (R) is given just below it. Mark the correct statement as.
Assertion (A): Compounds with two hydroxy groups are gem diols.
Reason (R): Ethanol which contains 5% methanol is known as methylated spirit.
a) (A) and (R) are true and (R) is the correct explanation of (A)
b) Both (A) and (R) are true but (R) does not explain (A)
c) (A) is true but (R) is false
d) Both (A) and (R) are false

20. 1 x 2 = 2
21. Pick out the wrong statement regarding ethers.
a) dimethyl ether and diethyl ehters are simple ethers
b) ethyl methyl ether is a symmetrical ether
c) the reaction between sodium ethoxide and methyl bromide is known as williamson's ether synthesis
d) Diethyl ether is used as an anaesthetiz.

22. 4 x 2 = 8
23. What is the major product obtained when two moles of ethyl magnesium bromide is treated with methyl benzoate followed by acid hydrolysis.

24. Explain 'esterification' reaction with an example.

25. What happens when phenol is treated with diazonium chloride in presence of NaOH?(OR) Give a brief account of coupling reaction.

26. State Saytzeff's rule.

27. 2 x 3 = 6
28. How is phenol prepared form
i) chloro benzene
ii) isoprophy benzene

29. Complete the following sequence of reaction and Identify A, Band C.

30. 3 x 5 = 15
31. Complete the following reactions

ii) $C_6H_5-CHCH(OH)CH(CH_3)_2 \overset{ConH_2SO_4}\longrightarrow$

32. An organic compound (A) (C6H6O) gives maximum of two isomers (B) and (C) When an alkaline solution of (A) is refluxed with chloroform. (B) on oxidation gives acid (D). The acid (D) is also obtained by I treating. sodium salt of (A) with CO2 under pressure followed by hydrolysis. Identify the compounds (A), (B), (C) and (D) and explain with proper chemical reactions.

33. An organic compound (A) of molecular formula C6H6O gives violet colour with neutral FeCI3. (A) gives maximum of two isomers (B) and (C) when an alkaline solution of (A) is refluxed with CCI4 (A) also reacts with C6H5N2CI to give the compound (D) which is red orange dye. Identify (A), (B), (C) and (D). Explain with suitable chemical reactions.