Elements of Symmetry

Q. Which of the following sets of molecules will have zero dipole moments?

1. Boron trifluoride, carbon tetrachloride, 1, 4-dichlorobenzene, sulphur dioxide
2. Ammonia, carbon dioxide, 1, 3-dichlorobenzene, water
3. Boron trifluoride, 1, 3-dichlorobenzene, ammonia, ethanal
4. Boron trifluoride, 1, 4-dichlorobenzene, carbon dioxide, carbon tetrachloride

Q. How many plane of symmetry does the $C{H}_4$ molecule contain?

Q. If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that

1. The compound is certainly meso
2. There is no compound in the solvent
3. The compound may be a racemic mixture
4. The compound is certainly a chiral

Q. Which of the following compound(s) has plane of symmetry?

1. $C{O}_2$
2. $HCN$
3. $BC{l}_3$
4. $N{O}^{+}$

Q. Identify the pairs of diastereomers from the following.

1. I and II, II and III
2. II and III only
3. I and III only
4. None of these

Q. How many diferent stereoisomers exist for the compound below?

1. 2
2. 4
3. 6
4. 3

Q. Which of the following molecules will have non-zero dipole moment?

1. 1, 2-dichlorobenzene
2. 1, 3, 5-trichlorobenzene
3. 1, 4-dichlorobenzene
4. Hexachlorobenzene

Q. Which of the following structures represent the same stereoisomer?

1. 
2. 
3. 
4. 

Q. The number of all the possible stereoisomers formed by the given compound is :

1. $2$
2. $3$
3. $4$
4. $5$

Q. What is the relationship between the given compounds?

1. Diastereomer
2. Enantiomer
3. Identical
4. Mesomers

Q.

Which of the following compounds has centre of symmetry?

1. 

2. All of these

3. 

4. 

Q. The types of hybridisation on the five carbon atoms from left to right in the molecule
$C{H}_3-CH=C=CH-C{H}_3$ are :

1. $s{p}^3,s{p}^2,s{p}^2,s{p}^2,s{p}^3$

2. $s{p}^3,sp,s{p}^2,s{p}^2,s{p}^3$

3. $s{p}^3,s{p}^2,sp,s{p}^2,s{p}^3$

4. $s{p}^3,s{p}^2,s{p}^2,sp,s{p}^3$

Q. Which of the following will show optical activity ?
A)
B)
C)
D)
E) 50/50 mixture of C and D

1. A , D and E
2. A and E
3. B, C and D
4. Only A

Q. Which of the following molecule have a centre of symmetry?

1. $C{O}_2$
2. $S{O}_2$
3. $BC{l}_3$
4. $H_{2}O$

Q. Which of the following molecules is/are optically active ?

1. I, III only
2. II, III only
3. I, II only
4. I, II and III

Q. In given molecule,

the hybridization of carbon 1, 2, 3 and 4 respectively, are :

1. $s{p}^2,s{p}^2,s{p}^2,s{p}^3$
2. $s{p}^2,sp,s{p}^2,s{p}^3$
3. $s{p}^3,sp,s{p}^3,s{p}^3$
4. $s{p}^2,s{p}^3,s{p}^2,s{p}^3$

Q.
How many stereoisomer of product (P) is possible ?

Q. Find the number of compounds which does not possess a plane of symmetry.

Q. In which of the following molecules, all atoms are coplanar ?

1. 
2. 
3. 
4. 

Q. Which of the following cyclopentane derivatives has plane of symmetry?

1. 
2. 
3. 
4. 

Q. Which of the following is/are true for a triplet carbene?

1. Only one unshared electron is present in each orbital.
2. There is only one unpaired electron.
3. Hybridisation of $C$ is $s{p}^3$
4. All of the above.

Q.

The correct statement(s) about the compound given below

1. The compound is optically active

2. The compound possesses centre of symmetry

3. The compound possesses plane of symmetry.

4. The compound possesses axis of symmetry.

Q. If there is no rotation of plane polarised light by a compound in a specific solvent, it may mean that:

1. The compound is certainly meso
2. There is no compound in the solvent
3. The compound is certainly a chiral
4. All of the above

Q.

Which of the following compounds has a zero dipole moment?

1. 

2. 

3. 

4. 

Q. The following electron configuration represents _______.


$1s2s{p}^{3}2s{p}^{3}2s{p}^{3}2s{p}^3$

1. The ground state of boron.
2. The hybridized state of carbon.
   
3. the hybridized state of nitrogen.
4. The ground state of carbon.

Q. What about this compound? Is it chiral?

1. Yes
2. Cannot be determined
3. No
4. Not enough data

Q. What is stoichiometry calculation??

Q. The molecule having three fold axis of symmetry is:

1. $N{H}_3$
2. $C{O}_2$
3. $C_2{H}_4$
4. $S{O}_2$

Q. Which of the following is expected to have net dipole moment equal to zero?

1. $H_2{O}_2$
2. $O_3$
3. $S{O}_2$
4. $Xe{F}_4$

Q.

Can we use the jugaad that sir has given to us to all the compounds that 5 degree subtracted two lone pair and 2.5 degree when one lone pair is present