+E Effect

Q.

How do you know if a Reaction is $\mathrm{SN}2$?

Q.

Which of the following represents + E effect ?

1. 

2. 

3. Both (a) and (b)

4. None of these

Q. Which of the following reaction(s) is/are not possible?
(i) $(C{H}_3{)}_{2}O+B{F}_3\to (C{H}_3{)}_{2}O\to B{F}_3$
(ii) $(Si{H}_3{)}_{2}O+B{F}_3\to (Si{H}_3{)}_{2}O\to B{F}_3$
(iii) $H_{3}N+B{F}_3\to H_{3}N\to B{F}_3$
(iv) $(C{H}_3{)}_{2}O+B{F}_4^{-}\to (C{H}_3{)}_{2}O\to B{F}_4^{-}$

1. (i), (iii), and (iv)
2. (i) and (ii)
3. (ii) and (iv)
4. (ii) and (iii)

Q. (a) What do you mean by covalent bond?
(b) Write the electron dot structure of methane and ethene.
(c) Explain the following with example.
(i) Addition reaction.
(ii) Displacement reaction.

Q.

Which of the following represents + E effect ?

1. Both (a) and (b)

2. None of these

3. 

4. 

Q.

Which of the following represents + E effect ?

1. 

2. 

3. Both (a) and (b)

4. None of these

Q. During hydrogenation reaction, H-H bond splits and hydrogen atoms are attached to Ni catalyst through through strong chemical forces.

1. True
2. False

Q. During hydrogenation reaction, H-H bond splits and hydrogen atoms are attached to Ni catalyst through weak van der Waal forces.

1. True
2. False

Q. Nitrobenzene on reduction using zinc in alkaline medium results in ${}^{\prime }{X}^{\prime }$. The number of sigma $\left(\sigma \right)$ and pi $\left(\pi \right)$ bonds in ${}^{\prime }{X}^{\prime }$ is:

1. $24\sigma ,7\pi$
2. $24\sigma ,6\pi$
3. $27\sigma ,7\pi$
4. $27\sigma ,6\pi$

Q.

Which of the following represents + E effect ?

1. 

2. 

3. Both (a) and (b)

4. None of these