Introduction to Haloalkanes

Q. Arrange the following bonds according to their average bond energies in descending order :
$C-Cl,C-Br,C-F,C-I$

(JEE MAIN 2020)

1. $C-F>C-Cl>C-Br>C-I$
2. $C-I>C-Br>C-Cl>C-F$
3. $C-Cl>C-Br>C-I>C-F$
4. $C-Br>C-I>C-Cl>C-F$

Q.

The reactivity of ethyl chloride is

[KCET 1986]

1. More or less equal to that of chlorobenzene

2. More or less equal to that of benzyl chloride

3. More than that of benzyl chloride

4. Less than that of chlorobenzene

Q.

The reactivities of methyl chloride, propyl chloride and chlorobenzene are in

the order

[KCET 1988]

1. Methyl chloride > propyl chloride > chlorobenzene

2. Propyl chloride > methyl chloride > chlorobenzene

3. Methyl chloride > chlorobenzene > propyl chloride

4. Chlorobenzene > propyl chloride > methyl chloride

Q. Prove the following identity:
$\frac{sinA}{1+cosA}+\frac{1+cosA}{sinA}=2cosecA$ [3 MARKS]

Q.

There are 300 shelves in a gym. Each shelf has 2 lockers. The gym just opened today. Ram and Arjun are its first 2 customers. It is given that Ram is allotted one locker in the ${235}^{th}$ shelf. What is the probability that Arjun also is allotted a locker in the ${235}^{th}$ shelf?

1. 

2. 

3. 

4. 

Q.

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is:

1. Mg < K < Na < Rb

2. Mg < Na < K < Rb

3. Mg < Na < Rb < K

4. Na < K < Rb < Mg

Q. The reagent used for dehalogenation

1. $Zn$
2. $Na$
3. $Al$
4. $Fe$

Q. Which is not primary halide?

1. iso-butylchloride
2. sec-butylchloride
3. iso-pentylchloride
4. neo-pentylchloride

Q. Among the following, the molecule with the highest dipole moment is:

1. $C{H}_{3}Cl$
2. $C{H}_{2}C{l}_2$
3. $CHC{l}_3$
4. $CC{l}_4$

Q. Ethyl bromide and isopropyl chloride can be distinguished by:

1. alcoholic $AgN{O}_3$
2. comparing their colours
3. burning the compounds on spatula
4. aqueous $KOH$ solution