Polarity and Dipole Moments

Q.

The correct order of decreasing dipole moment is:

1. CH₃Cl, CH₃Br, CH₃F

2. CH₃Br, CH₃Cl, CH₃F

3. CH₃Br, CH₃F, CH₃Cl

4. CH₃Cl, CH₃F, CH₃Br

Q. Which amongst the following is the strongest acid?

1. ${\mathrm{CHCl}}_3$
2. ${\mathrm{CHBr}}_3$
3. $\mathrm{CH}{\left(\mathrm{CN}\right)}_3$
4. ${\mathrm{CHI}}_3$

Q.

Explain why

The dipole moment of chlorobezene is lower than that of cyclohexyl chloride ?

alkyl halides, though polar, are immiscible with water ?

Grignard reagents should be prepared under anhydrous conditions ?

Q. The major product of the following chemical reaction is :

1. 
   
   
2. 
   
   
3. 
   
   
4. 
   
   

Q.

Which of the following haloalkane will have the highest boiling point?

1. CH₃Cl

2. CH₃I

3. CH₃Br

4. CH₃F

Q.

Chemical name of -NR₃+, -SO₂R, -NH₃+, -OAr, -SR, -OR , SO₂Ar , -SR₂+

Q. Suggest the most important type of intermolecular attractive interaction in the following pairs.
(i) n-hexane and n-octane
(ii) $I_2$ and $CC{l}_4$
(iii) $NaCl{O}_4$ and water
(iv) methanol and acetone
(v) acetonitrile $\left(C{H}_{3}CN\right)$ and acetone $\left(C_3{H}_{6}O\right)$

Q. 8. Which of the following is a polar molecule? (1) Para dichlorobenzene (2) Carbon tetrachloride (3) Tetrachloroethene (4) HO OH

Q.

${\text{BeF}}_2$ has zero dipole moment whereas ${\mathrm{H}}_2\mathrm{O}$ has a dipole moment because:

1. Water is linear

2. ${\mathrm{H}}_2\mathrm{O}$ is bent

3. $\mathrm{F}$ is more electronegative than $\mathrm{O}$

4. Hydrogen bonding is present in ${\mathrm{H}}_2\mathrm{O}$

Q. in comparison to ethyl chloride it is difficult to carry out nucleophilic substitution on vinyl chlorid

Q. Haloarenes are less reactive than haloalkanes and haloalkenes. Explain.

Q.

Which one of the following has the highest dipole moment ?

$C{H}_{2}C{l}_2$

$CHC{l}_3$

$CC{l}_4$

Q. Which of the following amines will form stable diazonium salt at 273-283 K ?

1. $C_2{H}_{5}N{H}_2$
2. $C_6{H}_{5}N{H}_2$
3. $C_6{H}_{5}C{H}_{2}N{H}_2$
4. $C_6{H}_{5}N(C{H}_3{)}_2$

Q. 8 Two isomers A and B having formula C3H8O react with Na evolving hydrogen gas . If both of them are separately passed over hot alumina at 350 degree Celsius then then compound C is obtained .identify A ., B, C and the respective reactions

Q.

Is CH₃−CH₃ a hydrogen bond?

Q.

The reactivity of halogen atom is minimum in

[KCET 1985]

1. Propyl chloride

2. Propyl iodide

3. Isopropyl chloride

4. Isopropyl bromide

Q.

The correct order of dipole moment is

1. 

2. 

3. 

4. 

Q.

Soap forms lather in distilled water. When a small amount of magnesium chloride is added to distilled water no lather is formed with soap. Write the reaction responsible for the second observation.

Q.
The above transformation proceeds through:

1. Electrophilic addition
2. Benzyne intermediate
3. Nucleophillic substitution
4. Oxirane

Q. Assertion : $Pb{I}_4$ is a stable compound.
Reason : Iodide stabilizes higher oxidation state

1. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
3. If the Assertion is correct but Reason is incorrect
4. If both the Assertion and Reason are incorrect

Q.

Sodium is less reactive than Potassium. Justify.

Q. The major products after nitration of chlorobenzene is

1. Only m-substituted product
2. Mixture of para- and meta-substituted product
3. Mixture of ortho- and para-substituted product
4. Mixture of ortho- and meta-substituted product

Q.

Benzene is unreactive because

1. It has double bonds

2. It has carbon-carbon single bond

3. Carbon are sp² hybridised

4. electrons are delocalised

Q. For chloro alkanes containing the same halogen reactivity is maximum for 1) primary halide 2) secondary halide 3) tertiary halide 4) all of these

Q. 75 Primary alkyl halide C4H9Br (a) reacted with alcoholic KOH to give compound (b). compound (b) is reacted with HBr to give (c) which is isomer of (a).when (a) is reacted with sodium metal its gives compou(d), C8H18 which is different from compound formed when n-butyl bromide is reacted with sodium. Give the structure formula of (a) and write the equation for all reaction?

Q. The correct sequence of decreasing number of $\pi$-bonds in the structures of $H_{2}S{O}_3,H_{2}S{O}_{4}and{H}_2{S}_2{O}_7$ is:

1. $H_{2}S{O}_3>H_{2}S{O}_4>H_2{S}_2{O}_7$
2. $H_{2}S{O}_3>H_2{S}_2{O}_7>H_{2}S{O}_3$
3. $H_2{S}_2{O}_7>H_{2}S{O}_4>H_{2}S{O}_3$
4. $H_2{S}_2{O}_7>H_{2}S{O}_3>H_{2}S{O}_4$

Q. What is hinderence?

Q. Which of the following has the highest reducing power?

1. $HI$
2. $HBr$
3. $HCl$
4. $HF$

Q.

Is there a nucleophile that's a cation? If yes how is it formed?

Q. Which of the following statements is/are correct?

1. Dipole moment of:
   
2. Dipole moment of: $C{H}_{3}F>C{H}_{3}Cl$
   
3. Dipole moment of : $N{H}_3>N{F}_3.$
4. Dipole moment of: $C{H}_{3}Cl>C{H}_{2}C{l}_2>CHC{l}_3>CC{l}_4.$