Hybridisation in Carbon

Q. no of pi electrons in anthracene is 14 why it is not 18 as antrhacene is fusion of 3 benzene rings

Q.

The bond between carbon atom (1) and carbon atom (2) in compound $N\equiv C-CH=C{H}_2$ involves the hybridised carbon as

1. sp² and sp²

2. sp³ and sp

3. sp and sp²

4. sp and sp

Q.

Number of ${}^{\pi }$ electrons in cyclobutadienyl anion $(C_4{H}_4{)}^{-2}$ is?

1. 2

2. 4

3. 6

4. 8

Q.

In benzene, carbon uses all the three p - orbitals for hybridization.

1. True

2. False

Q. The hybridisations of $BC{l}_3$ and $NC{l}_3$ respectively are:

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

Q. If $N{H}_3$ reacts with $HCl$, the $H-N-H$ bond angle in the product species will:

1. Decrease
2. Remain the same
3. Depend upon the temperature
4. Increase

Q.

Number of ${}^{\pi }$ electrons in cyclobutadienyl anion $(C_4{H}_4{)}^{-2}$ is

1. 2

2. 4

3. 6

4. 8

Q.

Which of the following is a polar compound

1. C₂H₆

2. CH₄

3. CCl₄

4. HCl

Q. the hybridisation of S in orthorombic sulphar is sp3.How?

Q. In which of the following structures the pair of starred carbon atom do not lie in the same plane

1. 

2. 

3. 

4. 

Q.

The type of hybridization found in ethyne molecule is:

1. sp²

2. sp³d

3. sp

4. sp³

Q.

The structure of $C{H}_2$= C = $C{H}_2$is

1. Linear

2. Planar

3. Non-planar

4. Has several resonance structures

Q. What are hybridisation states of each carbon atom in the following compounds?
$C{H}_2=C=O,C{H}_{3}CH=C{H}_2,(C{H}_3{)}_{2}CO,C{H}_2=CHCN,C_6{H}_6$

Q. Cl, Br and I shows +R or - R effect?

Q.

The hybridization state of carbon in carbon dioxide is:

1. sp

2. sp²

3. sp³

4. None of these

Q.

The nitration of a compound is due to the

1. NO₂

2. NO₃

3. NO

4. 

Q. Each carbon atom in benzene is in which state of hybridization?

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

Q. Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in $C_2{H}_4$ and $C_2{H}_2$ molecules.

Q. Inspite of presence of triple bond, why in benzyne all the carbon atoms are sp2 hybridised?

Q. The type of hybridisation of boron in diborane is :

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

Q. explain SP hybridization in acetylene molecule

Q.

A $s{p}^3$ hybridized orbital contains

1. 

2. 

3. 

4. 

Q. Match the following:
$\begin{array}{cccc}\text{(i)}& C{H}_{2}O& \text{(a)}& \text{Central atom is}sp\text{hybridised}\\ \text{(ii)}& BeC{l}_2& \text{(b)}& \text{Central atom is}s{p}^2\text{hybridised}\\ \text{(iii)}& NH{4}^{+}& \text{(c)}& \text{Central atom is}s{p}^3\text{hybridised}\\ \text{(iv)}& B{F}_4^{-}& \text{(d)}& \text{Central atom is}s{p}^2\text{hybridised and has a linear shape.}\end{array}$

1. (i - b), (ii - a), (iii - c), (iv - c)
2. (i - d), (ii - b), (iii - d), (iv - c)
3. (i - b), (ii - c), (iii - a), (iv - d)
4. (i - d), (ii - c), (iii - b), (iv - a)

Q.

p - character in ${sp}^2$ hybridization is:

1. 

2. 

3. 

4. 

Q. Which of the following has a bond formed by overlap of $sp-s{p}^3$ hybrid orbitals

1. $C{H}_2=CH-CH=C{H}_2$

2. $C{H}_2=CH-CH=C{H}_2$

3. $C{H}_3-C\equiv C-H$

4. $HC\equiv CH$

Q. is a nucleophilic substitution. Explain.

Q. The reaction $C{H}_{3}C{H}_{2}I+KOH\left(aq\right)\to C{H}_{3}C{H}_{2}OH+KI$, is classified as :

1. elimination
2. nucleophilic substitution
3. addition
4. electrophilic substitution

Q. What is the state of hybridisation of carbon in (a) $C{O}_3^{-2}$ (b) diamond (c) graphite?

Q. Cl, Br and I shows +R or - R effect?

Q.

Which of the following can't be used in Friedal Craft's reactions

1. FeCl₃

2. FeBr₂

3. NaCl

4. AlCl₃