Preparation of Alkyl Halides

Q. Which compound undergoes faster $S_{N}1$ reaction?

1. 
2. Cannot be predicted
3. 
4. Both (a) and (b) at equal rate

Q. An alkene "A" on reaction with $O_3$ and $Zn–$$H_{2}O$ gives propanone and ethanal in equimolar ratio. Addition of $HCl$ to the alkene "A" gives "B" as the major product. The structure of the product "B" is:

1. 
2. 
3. 
4. 

Q. Which of the following reaction(s) can be used for the preparation of alkyl halides ?
(I) $C{H}_{3}C{H}_{2}OH+HCl\stackrel{anh.ZnC{l}_2}{\to }$
(II) $C{H}_{3}C{H}_{2}OH+HCl\to$
(III) $(C{H}_3{)}_{3}COH+HCl\to$
(IV) $(C{H}_3{)}_{2}CHOH+HCl\stackrel{anh.ZnC{l}_2}{\to }$

1. (IV) only
2. (III) and (IV) only
3. (I), (III) and (IV) only
4. (I) and (II) only

Q.

Preparation of alkyl halides in laboratory is least preferred by

[DPMT 2000]

1. Treatment of alcohols

2. Addition of hydrogen halides to alkenes

3. Halide exchange

4. Direct halogenation of alkanes

Q. The starting substance for the preparation of $C{H}_{3}I$ is

1. $C{H}_{3}OH$
2. $C_2{H}_{5}OH$
3. $C{H}_{3}CHO$
4. $(C{H}_3{)}_{2}CO$

Q. When (S)-2-bromopentane is brominated, several 2, 3-dibromopentane molecules are formed. Which of the following is not formed?

1. 
2. 
3. 
4. 

Q. $C{H}_2=CH-N{O}_2+HBr\to P$; The major product ${}^{\prime }{P}^{\prime }$ is:

1. 
2. 
3. 
4. 

Q.

Final product P is

1. 
   

2. 
   

3. 
   

4. 

Q. Choose the correct option(s) for the following set of reactions:

1. 
2. 
3. 
4. 

Q. $CH\equiv CH\underset{H_{2}S{O}_4}{\overset{HgSO4}{\to }}\left(X\right)\stackrel{LiAl{H}_4}{\to }\left(Y\right)\stackrel{PB{r}_3}{\to }\left(Z\right)$

$Z$ in the reaction is:

1. Ethylene bromide
2. Ethanol
3. Ethyl bromide
4. Ethylidene bromide

Q. Preparation of alkyl halides in laboratory is least preferred by

1. Treatment of alcohols
2. Addition of hydrogen halides to alkenes
3. Halide exchange

4. Direct halogenation of alkanes

Q. $C{H}_2=CH-N{O}_2+HBr\to P$; The major product ${}^{\prime }{P}^{\prime }$ is:

1. 
2. 
3. 
4.