Structure of Carbocation

Q. The number of stereoisomers of glucose are

1. 10
2. 14
3. 16
4. 20

Q. A benzyl carbocation is more stable than a methyl carbocation because of which of the following?

1. Resonance effect
2. Inductive effect
3. Electromeric effect
4. Hyper conjugation effect

Q. Most stable carbocation is:

1. 
   
2. 
   
3. 
   
4. 
   

Q. Consider the following bromides and compare them for their reactivity in $S_{N}1$ reaction.

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

Q. A benzyl carbocation is more stable than a secondary butyl carbocation mainly because of which of the following?

1. $–I$ effect of phenyl group
2. Hyperconjugation
3. $+I$ effect of phenyl group
4. Resonance effect of phenyl group

Q. Relative stabilities of the following carbocation will be in order:

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

Q. Most stable carbocation is:

1. $C{H}_3{-}^{+}C{H}_2$
2. ${}^{+}C{H}_2-C{H}_{2}N{O}_2$
3. ${}^{+}C{H}_{2}CHC{l}_2$
4. ${}^{+}C{H}_{2}C{H}_{2}Cl$

Q. Most stable carbocation is:

1. 
   
2. 
   
3. 
   
4. 
   

Q. 2-methylpent-2-ene on ozonolysis will give:

1. only propanal
2. propanal and ethanal
3. 2-propanone and ethanal
4. 2-propanone and propanal

Q. The correct stability order for 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 following pairs of halogen compounds, which compound undergoes faster S_N1 reaction?

(i)

(ii)

Q.

The next higher homolog of ethanol is ______.

1. Propanol

2. Methanol

3. Butanol

4. Pentanol

Q. Planar structure is shown by:

1. All of these
2. $C{O}^{2-}3$
   
3. $BC{l}_3$
   
4. $N(Si{H}_3{)}_3$

Q. D-Glucose and D-Mannose are

1. Anomers
2. Positional isomers
3. Functional isomers
4. Epimers

Q. What is the correct name of the following compound?

1. D-(+)-fructose
2. D-(-)-fructose
3. L-(+)-fructose
4. L-(-)-fructose

Q. Most reactive halide towards $S_{N}1$ reaction is:

1. n-butyl chloride
2. sec-butyl chloride
3. tert-butyl chloride
4. Allyl chloride

Q. Which of the following is true regarding a carbocation intermediate?

1. It is $s{p}^3$ hybridised and has a tetrahedral shape
2. It is $sp$ hybridised and has a linear shape.
3. It is $s{p}^2$ hybridised and has trigonal planar shape
4. It has a half filled p-orbital

Q. Arrange the following carbocations in decreasing order of their stability:

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

Q. What is the correct order of the following carbocations from most stable to least stable?
I) $C{H}_3-\stackrel{\oplus }{C}H-C{H}_3$
II) $C{H}_3-\stackrel{\oplus }{C}H-OC{H}_3$
III) $C{H}_3-\stackrel{\oplus }{C}H-C{H}_2-OC{H}_3$.

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

Q. The most stable and the least stable carbocation among $C{H}_2=CH\stackrel{+}{C}{H}_2\left(II\right),C_6{H}_5\stackrel{+}{C}{H}_2\left(III\right)andC{H}_3\stackrel{+}{C}HC{H}_3\left(IV\right)$ are respectively.

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

Q. What is the hybridisation of carbocation?

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

Q. What is the hybridisation of carbocation?

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

Q. 2)$C{H}_2=CH-\stackrel{⨁}{C}{H}_2$

1. $3>2>4>1$
2. $1>3>4>2$
3. $1>3>2>4$
4. $3>2>1>4$

Q. Which of the following carbocations is exepected to be most stable?

1. 
2. 
3. 
4. 

Q. D-Glucose and D-mannose are:

1. Metamers
2. Functional isomers
3. Epimers
4. Enantiomers

Q. Write these carbocations in decreasing order of their stabilities.

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

Q. Choose the correct option(s) regarding a carbocation intermediate :

1. It is $s{p}^2$ hybridised and has trigonal planar shape
2. It is $s{p}^3$ hybridised and has a tetrahedral shape
3. It has a vacant p-orbital
4. It has a half filled p-orbital

Q. Consider the following carbocations,
(I) $C_6{H}_5\stackrel{+}{C}{H}_2$
(II) $C_6{H}_{5}C{H}_2\stackrel{+}{C}{H}_2$
(III) $C_6{H}_5\stackrel{C}{H}C{H}_3$
(IV) $C_6{H}_5\stackrel{+}{C}(C{H}_3{)}_2$
The correct sequence of the stability of these is:

1. $IV<III<I<II$
2. $II<I<III<IV$
3. $III<I<II<IV$
4. $II<III<I<IV$

Q. Out of the following carbocations, how many are more stable than the benzyl carbocation?

\( \stackrel{\oplus}{-} \) ] II III IV V VI VII

Q. The most stable form of trans-1, 2 dimethyl cyclohexane is:

1. (1a, 2e)
2. (1a, 2a)
3. (1e, 2a)
4. (1e, 2e)