Chemistry_Today_April_2017_vk_com_stopthepress

SECTION-II
(MULTIPLE CORRECT ANSWER TYPE)
This section contains 4 multiple choice questions. Each
question has four choices (a) , (b) , (c) and (d) out of which
ONE or MORE may be correct. For correct answer 4 marks
will be awarded, no negative marks in this section.
9. Choose the correct options :
(a) Kolbe electrolysis of potassium succinate gives
CO 2
and CH 2
CH
.
2
(b) Ethyne is most acidic compound among ethane,
ethene and ethyne.
(c) The nodal plane in the π-bond of ethene is
located in the molecular plane.
(d) Alkynes are generally less reactive than alkenes
towards electrophilic reactions.
10. Which of the following statements are not correct ?
(a) Tertiary butyl alcohol gives positive iodoform
test.
H
(b) CH 3 CH 2 C CH 2 CH 3 gives positive
OH
iodoform test.
H H
(c) The carbon–carbon bond inR C C R
can
OH OH
be broken by the use of periodic acid and the
product obtained are two aldehydes.
2 1
3
F I N G E
R H
L R
(d) The carbon–carbon bond in R C C R
can
10
T H Y
OH OH
A R I C
be broken by the use of periodic acid giving
T T
16
two aldehydes.
I B E R
O
11. Decrease in atomic number is observed in
17
N E B U L
19 18
(a) α-emission
G A L V
(b) β-emission
E
22 21
23
(c) positron emission
K R Y P T
E A U
(d) electron capture.
26
R N T
N I T
12. Ammonia on reaction with hypochlorite ion can
E O O
form
L L N
(a) NO
(b) NH 4
Cl
30
(c) N 2
H 4
(d) HNO H Y 2
O
8
C H A L
A P
R
B
I
Z
L
A
O
A
D
C
1
P
R
N
E
I
N
N
C
R
O
SECTION-III
1
CH 3
4
R I N T
N I N E
I D O
N
D
L I U S
O S C O P Y
20
I S A T I O
Y
D
25
N C
T O S O L S
N N
28
E T
A
29
B O S C H
O M E T E R
N E S F
9
C H L
(INTEGER ANSWER TYPE)
This section contains 6 questions. The answer to each of
the questions is a single-digit integer, ranging from 0 to 9.
The bubble corresponding to the correct answer is to be
darkened in the ORS. For correct answer 4 marks will be
awarded, no negative marks in this section.
13. The relative reactivity of 1° : 2° : 3° hydrogens for
chlorination is 1 : 3.8 : 5. The compound 2-methyl
butane is monochlorinated. The carbon atoms in
this molecule are labelled as follows : [Treat C 4
as
different type of carbon from C 1
]
2 3 4
CH3 CH CH2 CH3
The maximum and minimum percentages will
occur at x and y carbon atoms respectively. Then
x + y is equal to
14. The highest boiling point is expected for which of
the following compounds?
(0) Methane (1) Ethane
(2) Propane (3) n-Pentane
(4) n-Butane (5) Iso-butane
(6) 2,2,3,3-Tetramethylbutane
(7) Iso-pentane (8) n-Octane
(9) Iso-octane
SOLUTIONS OF MARCH 2017 CROSSWORD
5 6 7
L I M O N E
P
N E
O R I N E I
M
14 15
E
L
L
I
I C
G
E
L
I
G
E
R
I
S
M
A
S
T
A
T
N N I
G I N
24
H B T E
A O E
27
M A R S H
D
A R S E N I C
A
U
X
11 12 13
CHEMISTRY TODAY | APRIL ‘17 25