Question 11
The NMR spectrum of ethylene glycol molecule will have
a)
Two singlets
b)
A triplet and a doublet
c)
Two doublets
d)
A singlet and a doublet
e)
Two triplets
Correct Answer:
a) Two singlets
Explanation:
The molecule ethylene glycol (HO-CH2CH2-OH) is a symmetric molecule. The proton in the -OH gives
one singlet peak and the proton in the methylene group of –CH2- gives another singlet peak. So, it
gives two singlet peaks only. Since it is a symmetric molecule, it does not give peak for another -
CH2OH group.
Question 12
Which of the following is a Bronsted-Lowry acid?
a)
CH2=CH2
b)
CH3NH2
c)
CH3CO2H
d)
CH3COCH3
e)
C6H10
Correct Answer
c) CH3CO2H
Explanation:
All Bronsted-Lowry acids will liberate a proton. The net charge may be zero, (+) or (-). In the above-
mentioned options, acetic acid (CH3CO2H) is the only molecule, which liberates a proton and acts as
a proton donor.
Question 13
Choose the correct phrase(s) for the following half-cell reactionCu
2+
(aq)
+ 2e
-
→Cu+
(aq)
I. It is a reduction reaction.
II. Reaction takes place in anode
III. Cu2+ is an oxidising agent.
a)
I & II
b)
I & III
c)
II & III
d)
I only