Hydrohalogenation of Alkenes

Q. Diborane is a Lewis acid forming addition compound $B_2{H}_6\cdot 2N{H}_3$ with $N{H}_3,$ a Lewis base. This -

1. Is ionic and exists as $\left[B{H}_2\right(N{H}_3{)}_2{]}^{+}$ and $[B{H}_4{]}^{-}$ ions
2. Both are correct
3. On heating, is converted into borazine, $B_3{N}_3{H}_6$ (called inorganic benzene)
4. None is correct

Q.

In the following questions two Statement-1 (Assertion) and Statement-2 (Reason) are provided. Each questions has 4 choices (a), (b), (c) and (d) for its answer, out of which ONLY ONE is correct. Mark your responses from the following options:
Statement- 1: 1-Butene on reaction with HBr in the presence of a peroxide produces 1-bromobutane.
Statement- 2: It involves the formation of a primary radical.

1. Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.
   

2. Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.
   

3. Statement-1 is true but Statement-2 is false.
   

4. Statement-1 is false but Statement-2 is true.

Q.

A gas formed by the action of alcoholic KOH on ethyl iodide, decolorizes alkaline KMnO₄ solution. The gas is

1. CH₄

2. C₂H₆

3. C₂H₄

4. C₂H₂

Q. What are the products formed when diborane reacts with each of the following compounds?

1. $B_2{O}_3$
2. $H_{3}B{O}_3$
3. $KB{O}_2$
4. $BC{l}_3$

Q. Which of the following is the most reactive alkyl halide for a $S_{N}1$ reaction?

1. 
2. 
3. 
4. 

Q. Arrange the following compounds in increasing order of their rate of hydrolysis by $S_{N}1$ mechanism.

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

Q. The correct reactivity order of following C = C / $C\equiv$ C bonds towards $B{r}^{\oplus }$ is:

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

Q.

Compounds A, B and C, respectively are:

1. 
2. 
3. 
4. 

Q.

Arrange the following compounds in decreasing order of reactivity with $B{r}_2$

$C{H}_2=C{H}_2\left(I\right),CH\equiv CH\left(II\right),C{H}_2=CHCl\left(III\right)$

1. II > I as well as III
   
   

2. I > II as well as III
   

3. II is more reactive than III but less than I
   

4. II is less reactive than III but more than I

Q. Which pair of the following gives the nature of reaction sequences given below?

1. Electrophilic addition and electrophilic substitution
2. Electrophilic addition and nucleophilic substitution
3. Nucleophillic addition and electrophilic substitution
4. Nucleophilic addition and free radical substitution