Hybridisation in Carbon

Q.

Hybridisation of the carbon atom of carbonyl group is

1. $\mathrm{sp}$

2. ${\mathrm{sp}}^2$

3. ${\mathrm{sp}}^3$

4. ${\mathrm{sp}}^3{\mathrm{d}}^2$

Q. Shape of the methane molecule is ________.

1. square planar
2. tetrahedral
3. trigonal planar
4. pyramidal

Q. The correct order regarding electronegativity of hybrid orbitals of carbon is :

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

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. In allene $\left(C_3{H}_4\right)$, the type(s) of hybridization of the carbon atoms is/are:

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

Q. Specify the hybridisations of the central atoms in $N_3^{-},NOCl$ and $N_{2}O$.

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

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.

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

1. Linear

2. Planar

3. Non-planar

4. Has several resonance structures

Q.

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

1. 2

2. 4

3. 6

4. 8

Q.

The nitration of a compound is due to the?

1. $N{O}_2$

2. $N{O}_3$

3. $NO$

4. $N{O}_2^{+}$

Q. Which of the following compounds have the same geometry among the following :
(i) $C_2{H}_4$
(ii) $AlC{l}_3$
(iii) $C{H}_4$
(iv) $N{F}_3$

1. $\left(i\right),\left(ii\right)$
2. $\left(i\right),\left(ii\right),\left(iv\right)$
3. $\left(i\right),\left(iii\right),\left(iv\right)$
4. $\left(iii\right),\left(iv\right)$

Q. Which among the following molecules has the shortest $CH$ bond length?

1. Ethane
2. Ethene
3. Ethyne
4. All of the above have equal $CH$ bond lengths

Q.

The geometry and the type of hybrid orbitals present about the central atom in $B{F}_3$ is

1. Linear, $sp$

2. Trigonal planar, ${sp}^2$

3. Tetrahedral, ${sp}^3$

4. Pyramidal, ${sp}^3$

Q. Chlorination of toluene in the presence of light and heat followed by treatment with aqueous $NaOH$ gives :

1. o-Cresol
2. $2,4–$Dihydroxytoluene
3. p-Cresol
4. Benzoic acid

Q. In the compound $C{H}_3-CH=CH-C{H}_2-C\equiv CH$, the hybridisation of C₁, C₃ and C₅ bonds respectively is

1. $s{p}^3,spands{p}^2$
2. $s{p}^3,s{p}^{3}andsp$
3. $sp,s{p}^{3}ands{p}^2$
4. $s{p}^2,spands{p}^3$

Q.

The above reaction proceeds through

1. Nucleophilic substitution

2. Electrophilic substitution

3. Free radical substitution

4. More than one of the above processes

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

1. False
2. True

Q. Specify the hybridisations of the central atoms in $N_3^{-},NOCl$ and $N_{2}O$.

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

Q. $\underset{6}{C}{H}_3-\underset{5}{C}H=\underset{4}{C}H-\underset{3}{C}{H}_2-\underset{2}{C}\equiv \underset{1}{C}H$
The hybridizations of the carbons numbered 1, 3 and 5 in the given hydrocarbon sequentially are:

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

Q.

The addition of $HCl$ to vinyl chloride gives 1, 1-dichloroethane because of?

1. Mesomeric effect of $Cl$

2. Inductive effect of $Cl$

3. Restricted rotation around double bond

4. None of these

Q. Number of $(s{p}^2-sp)$ hybridised carbon(s) in $C{H}_{2}CC{H}_2$ is/are :

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

Q.

Conversion of $C{H}_4$ to $C{H}_{3}Cl$ is an example of which of the following reaction?

1. Electrophilic substitution

2. Free radical addition

3. Free radical addition

4. Free radical substituion

Q.

The hybridization of carbons labelled 3, 4 and 5 in

$H{C}^1-C^2-C^{3}H=C^4=C^{5}H-C^{6}H=C^7{H}_2$ are?

1. $S{P}^2$ only

2. $S{p}^2$ in C-4 and $S{P}^3$ in 3 and 5

3. $S{p}^2$ in C-3 and C-5 and $SP$ in C-4

4. $SP$ only

Q. In the hydrocarbon $\underset{\left(1\right)}{C}{H}_2=\underset{\left(2\right)}{C}H-\underset{\left(3\right)}{C}\equiv CH$, the state of hybridisation of carbons 1, 2 and 3 respectively are:

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

Q. The geometry and the type of hybrid orbitals present about the central atom in $B{F}_3$ is .

1. Pyramidal, $s{p}^3$
2. Trigonal, ${sp}^2$
3. Linear, $sp$