Class-XII (For MP Board)
HALOALKANES AND HALOARENES
Objective
Type Questions
Q. 1. Choose the correct option:
1. Which of the following compounds will give blue
precipitate with AgNO3 solution :
(2) ΚΙΟ3 (b) CHI3 (c) KI (d)
CH₂I₂.
2. What is formed in the first step of SN1 reaction?
(a) Free radical (b) Carbanion
(c) Carbo Cation (d) Final product.
3. Which of the following compounds give acetylene on heating
with silver dust :
(a) CH₂I₂ (b) CH₂I (c) CHI3 (d) Cl4.
4. Which of the following compounds is known as Freon:
(a) CH2CI (b) CCl4 (c) CCl2F₂ (d) CF3
5. C-X bond is
(a) Non-polar (b) Ionic
(c) van der Waal (d) Polar
6. Which of the following is harmful for ozone layer
(a) CHI3 (b)
CCl4 (c) CCl₂F₂ (d) CH₂Cl₂
7. The carbon attached to the halogen atom in aryl halide is
(a) sp hybridized (b) sp² hybridized
(c) sp³ hybridized (d) sp3d hybridized.
8. What will be obtained on heating Ethyl iodide with alc.
KOH
(a) Ethanol (b) Ethane
(c) Acetylene (d) Ethylene
9. On heating C₂H5OH
with iodine and base the product formed is
(a) CH₂I
(b) CHI3 (c) CH,CHO
(d) CHCl3.
10. Raschig method is used for the manufacture of which of
the following:
(a) Chlorobenzene (b)
Benzene
(c) Toluene (d) Nitro-benzene
11.The reaction of
tert butyl bromide with sodium methoxide produces mainly
a.
isobutane
b. isobutylene
c.
tert-butyl methyl
ether
d.
sodium tert butoxide
12. Which of the
following undergoes nucleophilic substitution exclusively by SN1
mechanism?
a. Benzyl
Chloride
b.
Ethyl chloride
c.
Chlorobenzene
d.
Isopropyl chloride
13. The increasing
order of nucleophilicity would be?
a. Cl– <
Br– < I–
b.
I– <
Cl– < Br–
c.
Br– <
Cl– < F–
d.
I– <
Br– < Cl–
14. Which of the
following is most reactive towards SN1 reaction?
a. C6H5C(CH3)C6H5Br
b.
C8H5CH2Br
c.
C6H5CH(C6H5)Br
d.
C6H5CH(CH3)Br
15. CH3CH2CH2Br
+ NaCN → CH3CH2CH2CN
+ NaBr, will be fastest in
a.
ethanol
b.
methanol
c. N,
N-dimethylformamide
d.
Water
16. A Grignard reagent
may be made by reacting magnesium with
(a) Methyl amine (b)
Diethyl ether
(c) Ethyl iodide (d) Ethyl alcohol
17. C-Cl bond
of chlorobenzene in comparison to C-Cl bond in methyl chloride is
a.
Longer and weaker
b.
Shorter and weaker
c. Shorter
and stronger
d.
Longer and stronger
18. A solution of (+)
2-chloro-2-phenylethane in toluene racemises slowly in the presence of a small
amount of SbCl5, due to the formation of
a.
carbanion
b.
carbene
c.
free radical
d. carbocation
19. The decreasing
order of boiling points of alkyl halides is
a.
RF > RCl > RBr
> RI
b.
RBr > RCl > RCl
> RF
c. RI >
RBr > RCl > RF
d.
RCl > RF > RI
> RBr
20. Phosgene is
commonly known as
a.
thionyl chloride
b. carbonyl
chloride
c.
carbon dioxide and
phosphine
d.
phosphoryl chloride
Q. 2. Fill in the blanks :
1. The product of
sendmeyers reaction is..... (Chloro benzene)
2. The formula of harmful
product formed on keeping chloroform open is……… (COCl₂)
3. The general formula of
alkyl halide is.......... (RX)
4. On heating aromatic
primary amine with chloroform and alcoholic caustic potash a bad smelling gas…………is
formed (Phenyl
isocyanide)
5. Chloritone is a...........
of high quality (Hypnotic
medicine)
6. The formula of
refrigerant Freon is............ (CCl₂F2)
7. SN1 reaction occur in
step (Two)
Q. 3. Match the following:
'A' 'B'
1. SN1 (c) Free radical
2. SN2 (e) Secondary product.
3. Chloropicrin (b)
War gas
4. Chloritone (a) Hypnotic
5. Carbonyl chloride (d)
Phosgene gas
Q. 4. Answer in one word / sentence:
1. DDT is formed by the
reaction of chloro-benzene with which compound? (Chloral)
2. Which metal is used in
Wurtz synthesis? (Sodium)
3. When benzene is
treated with methyl chloride in the presence of anhydrous AICI, toluene is obtained
name the reaction. (Friedel-Craft reaction)
4. On heating Alkyl
halide with sodium metal, what will be formed? (Alkane)
5. What is formed on treating
benzene with Cl₂ in the presence of sunlight? (B.H.C.)
6. Alkyl halide is polar
in nature still it is insoluble in water. Why? Due to inability to form hydrogen bond.
