Nucleophile

Q. Which of the following acid is strongest?

1. $HCOOH$
2. $C{H}_{3}C{H}_{2}COOH$
3. $C{H}_{3}C{H}_{2}C{H}_{2}COOH$
4. $C{H}_{3}COOH$

Q.

Which of the following statements is not correct for a nucleophile?

1. Nucleophiles attack low electron density sites

2. Nucleophiles are not electron seeking.

3. Ammonia is a nucleophile

4. Nucleophile is a Lewis acid

Q.

Ammonia is more basic than phosphine because

1. P is greater in size than N
   

2. In phosphine, the H-P-H bond angle is ${90}^{\circ }$ while the H-N-H bond angle is ${107}^{\circ }$
   

3. N has greater electronegativity than P
   

4. Of all the above factors

Q. Which of the following is the electron deficient molecule.

1. $B_2{H}_6$
2. $C_2{H}_6$
3. $P{H}_3$
4. $Si{H}_4$

Q. Calculate the pH of $0.08M$ solution of hypochlorous acid,
$HOCl$. The ionization constant of the acid is $2.5\times {10}^{-5}$. Determine the percent dissociation of $HOCl$.

Q. Which of the following graph is valid for a solution containing phenol and aniline?
Assume that at the given constant temperature of solution, vapour pressure of phenol (A) in pure state is more than that of aniline (B) in pure state.

1. 
   
2. None of the above
3. 
   
4. 
   

Q. Calculate the pH of the solution in which $0.2MN{H}_{4}Cl$ and $0.1MN{H}_3$ are present. The ${\text{pK}}_b$ of ammonia is 4.75.

Q.

Which one of the following is not a pyrimidine base?

1. Thymine/T

2. Guanine/G

3. Cytosine/C

4. Uracil/U

Q.

The bond angle in alcohols is slightly less then the tetrahedral angle. It is due to which of the following reasons:

1. Because of the repulsion between the unshared electron pairs of oxygen.

2. Because of the bond length.

3. Because of the sp² hybridised state of the carbon attached to the oxygen atom.

4. Because of the sp hybridised state of the carbon attached to the oxygen atom.

Q. The correct order of acid strength of the following compounds is
(I) Phenol (II) p-Cresol (III) m-Nitrophenol (IV) p-Nitrophenol

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

Q.

How to calculate covalent radius?

Q.

Cyanide ion acts as an ambident nucleophile. From which end does it act as a stronger nucleophile in the aqueous medium?

1. It has the same strength from both the ends

2. It depends on the nature of the alkyl halide

3. It acts as a stronger nucleophile from the carbon end

4. It acts as a stronger nucleophile from the nitrogen end

Q. Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form ?

1. $AgBr$
2. $KBr$
3. $CsCl$
4. $ZnS$

Q.

The reaction of sodium ethoxide with iodoethane to form diethyl ether is termed as:

1. Radical substitution

2. Electrophilic substitution

3. Nucleophilic substitution

4. Electrophilic addition

Q.

Lipids are insoluble in water because they are

1. Neutral

2. Zwitter ions

3. Hydrophobic

4. Hydrophilic

Q. Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?

1. Seliwanoff's test
2. Barfoed's test
3. Biuret test for peptide bond
4. Benedict's test

Q. Decreasing order of relative nucleophilicity of the following nucleophiles in protic solvent is -
$\stackrel{\ominus }{S}H,AC\stackrel{\ominus }{O},Ph\stackrel{\ominus }{O},\stackrel{\ominus }{O}H,H_{2}O$

1. $\stackrel{\ominus }{S}H>\stackrel{\ominus }{O}H>H_{2}O>AC\stackrel{\ominus }{O}>Ph\stackrel{\ominus }{O}$
2. $\stackrel{\ominus }{S}H>\stackrel{\ominus }{O}H>Ph\stackrel{\ominus }{O}>AC\stackrel{\ominus }{O}>H_{2}O$
3. $\stackrel{\ominus }{S}H>Ph\stackrel{\ominus }{O}>\stackrel{\ominus }{O}H>H_{2}O>AC\stackrel{\ominus }{O}$
4. $\stackrel{\ominus }{O}H>\stackrel{\ominus }{S}H>Ph\stackrel{\ominus }{O}>AC\stackrel{\ominus }{O}>H_{2}O$

Q.

The chemical formula of Gypsum is:

1. ${\mathrm{CaCO}}_3·5{\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{CaSO}}_4·2{\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{CaSO}}_4·\frac{1}{2}{\mathrm{H}}_2\mathrm{O}$

4. ${\mathrm{CaCO}}_3·\frac{1}{2}{\mathrm{H}}_2\mathrm{O}$

Q.

Which of the following behaves as an ambiphilic reagent?

1. All the true

2. $C{H}_{3}CN$
   

3. $H_{2}O$

4. $C{H}_{3}CHO$
   

Q.

What are some examples of nucleophiles and strong bases?

Q.

The correct order of nucleophilicity among the following is :

1. I > II > III > IV

2. IV > III > II > I

3. II > III > I > IV

4. III > II > I > IV

Q. HOMO(Highest occupied molecular orbital) of CO Molecular is: 1)Non-bonding MO with slight antibonding character 2)Non-bonding MO with slight bonding character 3)Pure non bonding MO 4)None of the above

Q. Preparation of amines by Hoffmann ammonolysis of alkyl halides is an example of :

1. electrophilic substitution
2. nucleophilic substitution
3. electrophilic addition
4. nucleophilic addition

Q. Half life for the zero order reaction A(g)→ B(g) +C(g) and half life for the first order reaction X(g)→ Y(g) are equal. If completions time for the zero order reaction is 13.86 min, then calculate the rate cons†an t(in hr^{-1}) for the reaction X(g)→ Y(g)

Q. Which of the following statements is correct?

1. Ionic hydrides are very good conductors of electricity in solid state
2. Metallic hydrides conduct heat and electricity.
3. Ionic hydrides do not conduct electricity in solid state
4. Metallic hydrides are deficient of hydrogen.

Q. The correct order of reactivity of various acid derivatives is :

1. $RCOCl$ > $(RCO{)}_{2}O$ > $RCOOR$ > $RCON{H}_2$
2. $RCON{H}_2$ > $(RCO{)}_{2}O$ > $RCOOR$ > $RCOCl$
3. $(RCO{)}_{2}O$ > $RCOCl$ > $RCOOR$ > $RCON{H}_2$
4. $RCOOR$ > $RCOCl$ > $RCON{H}_2$ > $(RCO{)}_{2}O$

Q. Which of the following is/are nucleophiles?

1. $P{H}_3$
2. $F^{-}$
3. All of the above.
4. $Ph{S}^{-}$

Q.

Name a liquid hygroscopic substance _________

Q.

Q8. A hydroxide sparingly soluble in water is

1. Magnesium hydroxide

2. Ferrous hydroxide

3. Ferric hydroxide

4. Calcium hydroxide

Q.

Which of the following are ambident nucleophiles?

1. ${\mathrm{Br}}^{–}$

2. ${\mathrm{CN}}^{–}$

3. ${{\mathrm{NO}}_2}^{–}$

4. Both (B) and (C)