31.

Among the following structures the one which is not a resonating structure of others is

            

• I

• II

• III

• IV

Among the following compounds, the one(s) that gives (give) effervescence with aqueous NaHCO₃ solution is (are)

(CH₃CO)₂ O           CH₃COOH         PhOH          CH₃COCHO

   I                           II                   III                 IV

• I and II

• I and III

• Only II

• I and IV

The 4th higher homologue of ethane is

• butane

• pentane

• hexane

• heptane

Among the following, the one which is not a "green house gas", is

• N₂O

• CO₂

• CH₄

• O₂

Metal ion responsible for the Minimata disease is

• Co²⁺

• Hg²⁺

• Cu²⁺

• Zn²⁺

The most likely protonation site in the following molecule is    

• C-1

• C-2

• C-3

• C-6

The order of decreasing ease of abstraction of hydrogen atoms in the following molecules

• H_a > H_b > H_c

• H_a > H_c  > H_b

• H_b > H_a > H_c

• H_c > H_b > H_a

Among the following statements about the molecules X and Y, the one(s) which correct is (are)

• X and Y are diastereomers

• X and Y are enantiomers

• X and Y are both aldohexoses

• Xis a D-sugar and Y is an L-sugar

The rate of a certain reaction is given by, rate = k [H⁺]ⁿ. The rate increases 100 times when the pH changes from 3 to 1. The order (n) of the reaction is

• 2

• 0

• 1

• 1.5

If Cl₂ is passed through hot aqueous NaOH, the products formed have Cl in different oxidation states. These are indicated as

• -1 and +1

• -1and +5

• +1 and +5

• -1and +3