REDOX REACTIONS Quiz-4

Chemistry Aptitude Quiz

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. Of the following compounds, whose ozonolysis proves the Kekule structure of benzene?

•  Benzene
•  Toluene
•  o-Xylene
•  p-Xylene

Solution
(c) o-Xylene on ozonolysis gives glyoxal: methylglyoxal: dimethyl glyoxal in the ratio 3:2:1, which proves the existence of resonance in benzene and hence proves the Kekule structure of benzene. So the answer is (c)

Q2.

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Solution
(a) NH_4HS selectively reduces (-NO_2) group parato the (Me) (EDG) group, whereas (SnCl_2+HCl) selectively reduces (-NO_2) group orthoto the (Me) (EDG) group. So the answer is (a)

Q3.  An oxidation process involves

•  Increase in oxidation number
•  Decrease in oxidation number
•  Both decrease and increase in oxidation number
•  No change in oxidation number

Solution
(a) The statement is self-explanatory

Q4.  

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Solution

Q5.The equivalent weight of MnSO_4 is Half its molecular weight when it is converted to

•  Mn_2 O_3
•  MnO_2
•  MnO_4^( ⊖)
•  MnO_4^( 2-)

Solution
  (b)
∴ Equivalent weight =M/2

Q6. Caprolactone on reduction with LAH or H_2 + Pt or Pd gives:

•   Butane –1, 4-diol
•  Pentane -1,5–diol
• Hexane -1, 6-diol
•  Heptane –1, 7-diol

Solution

Q7.The oxidation number of S in Na_2 S_4 O_6 is

•  +0.5
•  2.5
•  +4
•  +6

Solution

Q8.

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Solution
Part B

Q9.

•  〖2CH〗_3 CH_2 OH〖2CH〗_3 CH_2 OH〖2CH〗_3 CH_2 OH
•  〖2CH〗_3 CH_2 OH No reaction 〖2CH〗_3 CH_2 OH
•  〖2CH〗_3 CH_2 OH No reaction No reaction
•  No reaction No reaction 〖2CH〗_3 CH_2 OH

Solution

Q10. 

•  MnO_2in (A)andCrO_3(in glacial acetic acid) in (B)
•  CrO_3in(A) andMnO_2 in (B)
•  Both are correct
• Both are incorrect

Solution
(a) In (A) the oxidation of allylic1°alcohol to aldehyde is carried out with MnO_2, while in (B) the oxidation of 2° alcohol to ketone is carried out with CrO_3+CH_3 COOH. So the answer is (a)

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