Stability of Carbocation

Q. 7. Hydrated halides of Be and Mg suffer hydrolysis on heating

Q. Select the most stable carbocation among the following

1. 

2. 

3. 

4. 

Q. What is Bredt's rule?

1. A double bond cannot be formed at the bridgehead
2. Double bonds can only be formed at the bridgehead
3. Double bonds cannot be formed in the molecules having a bridgehead
4. All of the above

Q.

How do you know if a compound is thermodynamically stable?

Q. The correct order of stability is:

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

Q.

Consider the following carbanions and arrange the decreasing order of their stability

1. II>III>IV>I

2. : III>IV>I>II

3. IV>I>II>III

4. I>II>III>IV

Q. 78 Write structures of various carbocations that can be obtained from 2-methylbutane. Arrange these carbocations in order of increasing stability

Q. What is the reason for the exceptional stability of the cyclopropylmethyl carbocation than benzyl carbocation ?

Q. Which of the following carbocation is least stable

1. 

2. 

3. 

4. 

Q. { Ex-IO. For acetic acid }(CH_3CO_2H) : }} (a) Draw three resonance structures; } (b) draw a structure for the resonance hybrids; } (c) rank the three resonance structures and the resonance hybrid in order } of increasing energy.

Q. Which one of the following species does not exist under normal condition 1)Li_{2 } 2)B{e^+}_3 3)Be_2 4)B_2

Q.

The oganic reaction which proceeds through heterolytic bond cleavage are known as:

1. Ionic reactions

2. Free radical reaction

3. Covalent reactions

4. Polar reactions

Q. which of the following species is isostructural , planar and non polar 1.ClF3, BrF3, xeo3 2. clo4^- , so4^{2-}, po4 ^{3-} 3.{I^-}_3, Hgcl2, xef2 4.{I^+}_3, xef3^{+ }, s_3^{2-

Q.

An allylic carbocation is less stable than

1. a vinyl cation

2. 

3. neopentyl cation

4. None of these

Q. what is the hybridization of benzyl carbonium ion and explain i

Q. 27.The hybridisation of C atoms in CH2=CH-CO-CH3 are

Q. 21.In the reaction NH3(g)+H2O(l)-NH3(aq), what is Kp?

Q. 17. What is the overall dissociation constant of [M(NH3)4]+ ion if beta for this complex is 2.1 * 10

Q. 14. Does Mg(NH4)PO4 gives NH3 on heating??

Q. 3-Bromo-2-methylbutane reaction with NaOCH2CH3 give major product?

Q. which of the following reaction Kp=4 alfa squre P/(1- alfa^2) 1. N2O4(g)+2NO2(g) 2 H2(g)+ I2(g) = 2HI(g) 3 N2(g) + 3H2(g) = 2NH3(g) 4 PCl3(g) + Cl2(g) = PCl5(g)

Q.
The correct stability order of the following species is:

1. (II) > (IV) > (I) > (III)
2. (I) > (II) > (III) > (IV)
3. (II) > (I) > (IV) > (III)
4. (I) > (III) > (II) > (IV)

Q. In the organic compound $C{H}_2=CH-C{H}_2-C{H}_2-C\equiv CH$, the pair of hybridized orbitals involved in the formation of $C_2-C_3$ bond is:

Q. An alkene A contains three $C-C$, eight $C-H\sigma$ bonds and one $C-C\pi$ bond. A on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write IUPAC name of A.

Q. In the organic compound $C{H}_2=CH-C{H}_2-C{H}_2-C\equiv CH$, the pair of hydridized orbitals involved in the formation of: $C_2-C_3$ bond is

Q.

The reaction, CO(g) + 3H₂(g)CH₄(g) + H₂O(g) is at equilibrium at 1300 K in a 1L flask. It also contain 0.30 mol of CO, 0.10 mol of H₂ and 0.02 mol of H₂O and an unknown amount of CH₄ in the flask. Determine the concentration of CH₄ in the mixture. The equilibrium constant, K_c for the reaction at the given temperature is 3.90.

Q. Pick out the correct statement from the following and choose answer from the codes given below:
I. Prop - 1, 2 - diene is conjugated diene II. Hexa - 1, 3 - diene is conjugated diene
III. Buta - 1, 3 -diene is an isolated diene IV. Prop - 1, 2 -diene is a cumulative diene

1. $II,III$
2. $III,V$
3. $II,IV$
4. $IV,V$

Q. Which of the following is not hypovalent a. CH_3^+ b. B_2H_6 c. NH_2^+ d. AlF_{

Q.

Among the following compounds which can be dehydrated very easily is

1. 

2. 

3. 

4. 

Q.

Which of the following is aprotic nonpolar solvent?

1. liquified $N{H}_3$
   

2. $(C{H}_3{)}_{2}S=O$
   

3. $CC{l}_4$
   

4. $HCON(C{H}_3{)}_2$