Electrophiles and Nucleophiles

Q.

A nucleophile is:

1. Electron-rich species

2. Electron-deficient species

3. A Lewis acid

4. Positively charged species

Q.

An electrophile is:

1. an electron-rich species

2. a Lewis base

3. a negatively charged species

4. an electron-deficient species

Q.

Which of the following is not an electrophile?

1. Aluminium tribromide

2. Boron trifluoride

3. Ammonia​​​​​

4. Tin (IV) chloride

Q.

Which one is the most basic in aqueous solution?

1. Ammonia

2. Methanamine

3. Dimethylamine

4. Trimethylamine

Q.

Which of the following is an electrophilic agent?

1. Water

2. Hydroxide

3. Nitronium

4. None of these

Q. Nucleophiles may be negatively charged, neutral or they may contain double bonds.

1. True
2. False

Q. In neutral molecules such as $HX$, due to polarity of the $H-X$ bond a partial positive charge is generated on the halogen atom $X$.

1. True
2. False

Q. is an electrophile.

1. $B{H}_3$
2. $N{H}_3$
3. $H_{2}O$
4. $C{H}_{3}OH$

Q. is not a nucleophile.

1. $H_2$
2. $C{H}_{3}OH$
3. $H_{2}O$
4. $N{H}_3$

Q. The hybridisation of boron in $B{H}_3$ molecule is .

1. $s{p}^3$
2. $s{p}^2$
3. $sp$
4. $s{p}^{3}d$