(c) neo-pentane > iso-pentane > n-pentane
Alkanes
(d) n-pentane > neo-pentane > iso-pentane.
1. The IUPAC name of the given structure K is
6. DecarboxylatiOI} of isobutyric acid leads to
(a) iso-butane (b) propane
(a) neobutane (b) tertiary butane (c) butane (d) none of these.
(c) 2,2-dimethylpropane (d) neopentane. 7. Which of the following alkanes cannot be produced by Kolbe
2. The correct IUPAC name of the following alkane is electrolysis of sodium or potassium salts of carboxylic acids?
(a) Methane (b) Ethane (c) Butane (d) Hexane
H 3 C-CH 2 -9H-CH 2-CH2 -9H-CH 2-CH 3
CH CH., 8. The formation of butane on heating C 2 H 51 with Na in presence
/\ I - of ether is contaminated with impurities of
H 3 C CH 3 CH 3
(a) C 2 H 4 (b) C 3 H 6
(a) 3,6-diethyl-2-methyloctane (c) CH 4 (d) none of these.
(b) S-iso-propyl-3-ethyloctane
( c) 5-ethyl-5-iso-propyloctane
9. Which of the following reactions will not give propane ?
( d) 3-iso-propyl-6-ethyloctane. (a) CH CH CH Cl Mgle th er )
3 2 2 H20
3. The compound which has one isopropyl group is CH 3 MgX
(b) CH COCl )
(a) 2,2,3,3-tetramethylpentane 3 H20
(b) 2,2-dimethylpentane B, H 6
(c) CH3CH==CH2 CH3~00H )
(c) 2,2,3-trimethylpentane
(d) 2-methylpentane.
(d) CH 3 CH 2 CH 2COONa + NaOH Cao )
4. Which statement is not true concerning alkanes ? 10. An alkyl bromide, RBr of molecular weight 151 is the exclusive
(a) Large number alkanes are soluble in water.
product of bromination of which hydrocarbon?
(b) All alkanes have a lower density than water. (a) Dodecane (b) 2,2-Dimethylpropane
(c) At room temperature some alkanes are liquids, some (c) 2,2-Dimethylhexane (d) 2,2,3-Trimethylheptane
solids and some gases.
( d) All alkanes possess Weak van der Waal's forces.
11. The highest boiling point is expected for
( a) iso-butane
5. The decreasing order of boiling points is (b) n-octane
(a) n-pentane > iso-pentane > neo-pentane (c) 2, 2, 3, 3-tetramethylbutane
(b) iso-pentane > n-pentane > neo-pentane (d) n-butane.
DPP038/ NC/1
12 · Metha
ne on complet duct formed when I-bromo-3.chlor
(a) acetylene e combusti on gives Jd be the pro 0
21. What wou 'th two equivalen ts of metallic sodiu .
cyclobutanc reacts w1 rn in
(c) methyl alcohol (b) tnethanal
(d) CO2+ H20, ether? Cl
13. What is th h '
e c ief p ro d uct obtained I
With b rornine in th
(a) CH -
w icn 11 -butanc is treated
~ e presence of light at l3o•c ? (a)
Br
p (b)d
3 CH2~7 H-Br (b) CH3-TH -CH2~B r (d) [ZJ
CH.1 CH.1 (c) D
yH3
(c) CH,-C -Br 22. Which of the following does not decolour ise bromine solution
- I
CH 3 in carbon disulphid e?
(b) Propene
·
14• Which of the followin (a) Acetylene
monosub stituted
alka
l .
nes give more than three isomeric
pro uct upon halogenation?
(c) Ethane
(d) Propyne
is obtained as the only
. product on sub,·ecting
TH3 23 • An aIkane, C8H 18
(a) CH3~C H-CH 2-CH (b) CH -CH-C H a primary alkyl halide to Wurtz reaction. On_monobromination
I 3 3 3 this alkane yields a single isomer of a tertiary bromide. The
CH3
TH3 CH3 CH3 primary alkyl halide is
(b) iso-butyl halide
(d) CH3-b - ~-CH (a) 1-chloro butane
(c) CH3-CH2-c,-CH3 3 (d) neo-pent yl halide.
I I (c) iso-pentyl halide
. ~H3 CH3 CH3
15 In - 24. Among the three conform ations of ethane, the order of
• the di_chlonnation reaction of propane, mixture of products
are obtamed . How many isomers the mixture contains ? stability follows the sequence :
(a) 2 (b) 3 (c) 4 (d) 5 (a) eclipsed > gauche > staggered
(b) eclipsed > staggered > gauche
16. When ethyl bromide and n-propyl bromide are allowed to
react with sodium in ether, they form (c) staggered > gauche > eclipsed
(a) single alkane (d) gauche> staggere d> eclipsed
(b) mixture of two alkanes 25. Few reactions of alkanes are given below. Identify the name of
(c) mixture of three alkanes the reaction which is not correctly matched with the reaction.
(d) mixture of four alkanes. CH 3
17, On monochl orination of n-pentan e, the number of straight (a) CH3CH2CH2CH 3 AICl3 + HCI) CH3-~H-C H3
chain isomers formed is
(d) I - Isomerisation
(a) 4 (b) 3 (c) 2 773 K
(b) C6H14- ---" C4H 8 + C2 H 6 -Pyrolysi s
18. Which of the following does not give alkane?
(c) CH4 + 20 2 ~ CO 2 + 2H 20 - Controll ed oxidation
(a) Reaction of CH3I with Na in ether.
4
(b) Electrolysis of concentr ated sodium acetate solution. (d) CH4 + HN0 3 oo•c CH3 N02 - Nitration
(c) Reductio n of alkene using platinum .
(d) Reaction of ethyl chloride with ale. KOH.
19. Which one of the following compoun ds does not form an
ozonide?
(a) Ethene (b) Propyne (c) Propene (d) Propane
20. Sample of 2,3-dibro mo-3-me thylpenta ne is heated with zinc
dust. The resulting product is isolated and heated with HI in
the presence of phospho rus. Indicate which is the structure 7
that present the final organic product formed in the reaction.
(a) CH3 - CH2- yH- CH2-CH3
CH3
yH3
(b) CH2=CH-C H-CH2-CH3
(c) CH3 -CH=C -CH2-CH3
I
CH3
(d) CH2=CH-C I-CH2 -CH3
I
CH3
DPP038/NC/2
