The most contributing structure in nitroethene among the following is-

1.  
2.  
3.  
4. 

In which of the followig molecules all the effects namely inductive, mesomeric and hyperconjugation operate ?

(1) (2) (3) (4)

The acid strength order is:

(1) I > IV > II > III

(2) III > I > II > IV

(3) II > III > I > IV

(4) I > III > II > IV

Acid strength of the conjugate acids of the following are-

(1) I > II > III > IV

(2) III > II > I > IV

(3) IV > III > II > I

(4) None of these

The acid dissociation constants of the following acids are given as under:

Compound K_a CICH₂COOH 136 × 10^–5 139 × 10^–5 8.9 × 10^–5 2.96 × 10^–5 CH₃CHCH₂COOH 1.52 × 10^–5 From this data, the following observations can be made. Mark the correct statements for above mentioned compounds.

(i) The above variation in acidities of the above acids are due to inductive effect only.

(ii) The above variation are both due to inductive and resonance effects.

(iii) Inductive effect varies sharply with distance.

(iv) –I effect of chlorine is not much.

(1) i and ii

(2) i and iii

(3) ii and iii

(4) iii and iv

If is mixed with NaOH solution. Acid base reaction occurs and HO- snatches H+ from organic molecule. Which carbon will loose H easily?

1. P

2. Q

3. R

4. S

The correct acidic strength order of acidic hydrogen x, y and z is respectively.

(1) x > z > y

(2) x > y > z

(3) z > y > x

(4) y > z > x

The correct basic strength order is:

(1) I > II > IV > III

(2) IV > III > II > I

(3) III > II > IV > I

(4) III > IV > II > I

The correct order of acid and basic strength for the following pair of compounds should be?

(1) I > II ; III > IV ; V > VI ; VII < VIII

(2) I < II ; III > IV ; V < VI ; VII > VIII

(3) I > II ; III > IV ; V > VI ; VII > VIII

(4) I < II ; III > IV ; V < VI ; VII < VIII

Observe the following reaction :

Which of the following is the correct order of acid strength :

(1)
(2)
(3)

(4)