Alcohol Phenol and Ether

DPP-3
[Preparation of Alcohols, Physical and Chemical Properties]

1. Mechanism of acid catalysed hydration 4. Which of the following are correct

reaction involves: statement(s)?
(a) Protonation of alkene to form (a) Polar nature of O–H bond is
carbocation by electrophilic attack responsible for acidic character of
alcohols.
of H+ (from H3O+).
(b) Acidic strength of alcohols follows
(b) Nucleophilic attack of water on the order 1° > 2° > 3°.
carbocation. (c) Lower alcohols are insoluble in water.
(c) Deprotonation to form alcohol. (d) Alcohols also react as Bronsted base.
(1) (a) and (b) (2) (a) and (c) (1) (a), (b) and (c)
(3) (a), (b) and (c) (4) (b) and (c) (2) (a), (b) and (d)
(3) (b), (c) and (d)
2. Which of the following are used to (4) (a), (c) and (d)
convert RCHO into RCH2OH?
5. Select incorrect option among the
(a) H2/Pd
following:
(b) LiAlH4 (1) Generally, alcohols are weaker acids
(c) NaBH4 than water.
(d) Reaction with RMgX followed by (2) Alcohols act as Bronsted acids as
hydrolysis well as Bronsted bases.
(1) (a) and (b) (3) During esterification, the side
(2) (a), (b) and (c) product is removed to shift the
(3) (b), (c) and (d) equilibrium to the product side.
(4) Alcohols can liberate H2 gas with
(4) (a) and (c)
moderately reactive metals such as
iron or tin.
3. Which statement is not correct about
alcohol? 6. Statement I: Esterification of alcohol
(1) Molecular weight of methanol is involves cleavage of O–H bond in alcohols.
higher than water. Statement II: Alcohols liberate hydrogen
(2) Alcohol having less no. of carbon gas on reaction with metallic sodium.
atoms is less soluble in water than (1) Both statement I and statement II are
alcohol having more no. of carbon correct.
(2) Statement I is correct but statement
atoms.
II is incorrect.
(3) Alcohol evaporates at a much faster (3) Statement I is incorrect but
rate compared with water. statement II is correct.
(4) All of the above (4) Both statement I and statement II are
incorrect.
7. Assertion: Methanol is most reactive 9. For the reaction,
alcohol towards sodium. C2H5OH+HX ⎯⎯⎯ → C2H5X+H2O
ZnCl2

Reason: Methanol is most acidic alcohol.

the order of reactivity is;
(1) Both Assertion (A) and Reason (R)
(1) HBr > HI > HCl
are true, and Reason (R) is a correct
(2) HI > HCl > HBr
explanation of Assertion (A).
(3) HI > HBr > HCl
(2) Both Assertion (A) and Reason (R)
(4) HCl > HBr > HI
are true, but Reason (R) is not a
correct explanation of Assertion
10. Match List-I with List-II and choose the
(A).
correct option.
(3) Assertion (A) is true, but Reason
List-I List-II
(R) is false.
(Reactions) (Products)
(4) Assertion (A) is false, but Reason
I. CH − CH = CH
3 A. CH3CH 2 OH
2
(R) is true.
⎯⎯⎯⎯⎯
(i)B2 H 6 /THF
H O /OH −
→
2 2

II. C3 H 7 COOH B. CH 3CH 2 CH 2 CH 2 OH

Conc. H 2SO 4
8. ⎯⎯⎯⎯⎯⎯
→ ⎯⎯⎯⎯
(i)LiAlH 4
(i)H 2 O
→
III. HCHO + CH 3 MgBr C. CH 3CH 2 CH 2 OH
The major product is:
⎯⎯⎯⎯
→dry ether
H3 O+

(1) (2) (1) I-B, II-A, III-C

(2) I-A, II-B, III-C
(3) I-C, II-B, III-A
(3) (4) (4) I-C, II-A, III-B