Tautomerism

Q. In a solid AB having the NaCl structure, A atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

(A) AB_2. (B) A₂B. (C) A₄B_3. (D) A₃B₄

Q.

Which of the following compounds are metamers?

1. 

2. 

3. 

4. 

Q. An element has a body centred cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is

1. $\frac{\sqrt{2}}{4}\times 288pm$
2. $\frac{4}{\sqrt{3}}\times 288pm$
3. $\frac{4}{\sqrt{2}}\times 288pm$
4. $\frac{\sqrt{3}}{4}\times 288pm$

Q.

Identify A, B, C, D, E, R and R¹ in the following:

Q. 1-easy method to find the magnetic behavior of compound

Q. Which of the following will show tautomerism?

1. 
2. 
3. 
4. 

Q. Among the given compounds, the correct order of enol content is:

1. I > II > III
2. III > II > I
3. II > I > III
4. II > III > I

Q.

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is

1. A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration

2. A carbonyl compound with a hydrogen atom on its alpha - carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation.

3. A carbonyl compound with a hydrogen atom on its alpha - carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism.

4. A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrated with its corresponding enol.

Q. Which of the following unit cell represent the first nearest atom distance in fcc?

1. 
2. 
3. 
4. 

Q. Tautomerism is not exhibited by :

1. 
2. 
3. 
4. 

Q.

Why are aromatic diazonium salts more stable than aliphatic diazonium salts?

Q. The compound(s) which show tautomerism is/are :

1. 
2. 
3. 
4. 

Q.

Keto-enol tautomerism is observed in

1. 

2. 

3. 

4. 

Q. The closest distance between two atoms (in terms of edge length) would be highest for which of the unit cell, assuming the edge length of each unit cell to be 'a'?

1. FCC unit cell
2. BCC unit cell
3. Diamond unit cell
4. Primitive cubic unit cell (SCC)

Q. Match the following:

Unit cell	Definition
(a) Primitive	(i) Contains one constituent at its body-centre other than corners
(b) End-centred	(ii) constituents only at the corners
(c) Face-centred	(iii) constituents at the centre of any two opposite faces other than corners
(d) Body- centred	(iv) constitutents at the centre of each face other than corners
	(v) constitutents only at the centre of cell

1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(v)
3. (a)-(v), (b)-(ii), (c)-(iv), (d)-(i)
4. (a)-(ii), (b)-(v), (c)-(iv), (d)-(i)

Q.

Tautomerism will be exhibited by:

1. $(C{H}_3{)}_{2}NH$

2. $(C{H}_3{)}_{3}CNO$

3. $R_{3}CNO$

4. $RC{H}_{2}N{O}_2$

Q.

Why CH4 has bond angle109 degree and 28minutes and ammonia a bond angle of 107degrees and water a bond angle of 104.5degree

Q. Which one of the following is a primitive unit cell?

1. Simple cubic
2. Body-centred cubic
3. Face-centred cubic
4. Both body-centred and face-centred cubic

Q. Which of the following has unstable enol form?

1. 
2. 
3. 
4. 

Q. Which of the following has highest % enol content in the liquid?

1. 
2. 
3. 
4. 

Q. Which of the following has highest priority based on atomic number.
CH2OH. (or) . C(CH3)3
CH2-CH2-OH. (or) CH(CH3)2

Q. The most stable enol form of the following compound is :

1. 
2. 
3. 
4. 

Q. Among the given compounds, the correct order of enol content is:

1. $III>II>I$
2. $II>III>I$
3. $I>II>III$
4. $II>I>III$

Q. Which of the following unit cells has constituent particles occupying the corner positions only?

1. Body-centered cell
2. Face centered cell
3. End-centered cell
4. Primitive cell

Q.
The number of compounds which undergo tautomerism to form an aromatic product are :

Q. Which of the following compounds can exhibit tautomerism?

1. A, B, C, D
2. B
3. D
4. B, C, D

Q. Why boiling point of cis isomer is greater than trans isomer?

Q. Which of the following compounds will exhibit tautomerism?

1. 
2. 
3. 
4. 

Q. Which of the following has the highest percentage of enol form in Keto-enol equilibrium?

1. 
2. 
3. 
4. 

Q. Arrange the carbanions,
$(C{H}_3{)}_3\overline{C},\overline{C}C{l}_3,(C{H}_3{)}_2\overline{C}H,C_6{H}_5\overline{C}{H}_2$ in order of their decreasing stability :

1. $(C{H}_3{)}_2\overline{C}H>\overline{C}C{l}_3>C_6{H}_5\overline{C}{H}_2>(C{H}_3{)}_3\overline{C}$
   
2. $\overline{C}C{l}_3>C_6{H}_5\overline{C}{H}_2>(C{H}_3{)}_2\overline{C}H>(C{H}_3{)}_3\overline{C}$
   
3. $(C{H}_3{)}_3\overline{C}>(C{H}_3{)}_2\overline{C}H>C_6{H}_5\overline{C}{H}_2>\overline{C}C{l}_3$
   
4. $C_6{H}_5\overline{C}{H}_2>\overline{C}C{l}_3>(C{H}_3{)}_3\overline{C}>(C{H}_3{)}_2\overline{C}H>$