Stability of Carbocation

Q.

Which of the following carbocation is most stable?
(a) $(C{H}_3{)}_{3}C.\stackrel{+}{C}{H}_2$ (b) $(C{H}_3{)}_3\stackrel{+}{C}$
(c) $C{H}_{3}C{H}_2\stackrel{+}{C}{H}_2$ (d) $C{H}_3\stackrel{+}{C}HC{H}_{2}C{H}_3$

Q.

What is the difference between the inductive effect and the resonance effect?

Q.

Which has highest bond dissociation energy?

CH3F. CH3Cl . CH3Br. CH3I

PLS EXPLAIIN IN DETAIL ans is ch3F

MY opinion ch3I coz in ch3F F is more electronegativity so it has pulled electrons therefore it is easier to break the bond

And CH3I. I will nt attract electron compared to F

Q. In which of the following compounds, the $C-Cl$ bond ionisation shall give most stable carbonium ion?

1. 
   
2. 
   
3. 
4. 
   

Q. $S_{N}1$ reaction is favoured by:

1. Bulky groups on the carbon atom attached to halogen atom
2. Small groups on the carbon attached to halogen atom.
3. Non-polar solvents
4. None of the above

Q.

Why phenol does not react with Carboxylic Acid?

Q. Which is the most stable carbocation?

1. Isopropyl cation
2. Triphenylmethyl cation
3. Ethyl cation
4. $n-$ propyl cation

Q. Which of the following species is most stable?

1. 
2. 
3. 
4. 

Q. The correct order of rates of solvolysis of the following compounds is:

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

Q. The most stable conformation of trans-1, 4-dimethylcyclohexane is represented as:

1. 
2. 
3. 
4. 

Q. A solution of (–) – 1– Chloro – 1– phenyl ethane in toluene racemises slowly in the presence of a small amount of $SbC{l}_5$ due to the formation of

1. carbanion
2. carbocation
3. carbine
4. free radical

Q. Which of the following represents the correct order of stability of the given carbocations?

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

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. Select the most stable carbocation among the following?

1. 

2. 

3. 

4. 

Q. In the following molecule,

Hybridisation of Carbon a, b and c respectively are:

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

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

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

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

Q. Which one of the following species is most stable?

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

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. Arrange the following in decreasing order of their acidic strengths :

1. $A>B>C>D$
2. $D>C>B>A$
3. $D>B>C>A$
4. $A>D>C>B$

Q. Which of the following carbocation is most stable?

1. $C_6{H}_5\stackrel{+}{C}{H}_2$
2. 
3. $(C_6{H}_5{)}_2\stackrel{+}{C}H$
4. $(C_6{H}_5{)}_3\stackrel{+}{C}$

Q.

Mark the correct increasing order of reactivity of the following compounds with HBr / HCl.

(a) I < II < III
(b) II < I < III
(c) II < III < I
(d) III < II < I

Q. Which of the following is called Sandmeyer's reaction?

1. 
2. 
3. 
4. 

Q. Which of the following statement regarding the $S_{N}1$ reaction shown by alkyl halide is incorrect?

1. The added nucleophile plays no kinetic role in $S_{N}1$ reaction.
2. The $S_{N}1$ reaction involves the complete inversion of the configuration of the optically active substrate
3. The $S_{N}1$ reaction on the chiral starting material ends up with racemisation of the product.
4. The more stable the carbocation intermediate the faster the $S_{N}1$ reaction.

Q.

In solid CsCl each Cl is closely packed with how many Cs

1. 8

2. 2

3. 6

4. 10

Q.

When 3-methylbutan-2-ol is treated with HBr; the following reaction takes place.

Q. 42 What happens when product of reaction between benzaldehyde and sodium bisulphite participates in reaction with NaCN?

Q. 57. If 0.2 M aq. solution of KCI is isotonic with 0.2 MK, SO at same temperature then vant Hoff factorof K2SO4 is(1) 0.2(2) 0.5(3) 0.8(4) 0.3

Q. Stability of alkyl carbocation can be explained by ?

1. Inductive effect
2. Hyperconjugation effect
3. Mesomeric effect
4. All of the above

Q. Which is the stable form of the given carbocation after rearrangement?

1. 
2. 
3. 
4. 

Q.

Arrange the following carbocations in decreasing order of stability

1. IV > III > I > V > II
   

2. IV > I > III > II > V
   

3. V > IV > I > III > II
   

4. V > IV > III > I > II

Q. Which one of the following is likely to give a precipitate with $AgN{O}_3$ solution?

1. $C{H}_2=CHCl$
2. $CC{l}_4$
3. $CHC{l}_3$
4. $(C{H}_3{)}_{3}CCl$