A compound possessing optical isomerism provided it has the molecular formula C₇H₁₆, would be:

1.	2,3-Dimethyl pentane	2.	2,2-Dimethyl butane
3.	2-Methyl hexane	4.	None of the above

 An alkene ‘A’ on ozonolysis gives a mixture of ethanal and pentan-3-one.
The IUPAC name of ‘A’ is :

1. 3-Ethylpent-2-ene

2. 3-Ethylpent-2- yne

3. 2-Ethylpent-3-ene

4. 3-Ethylpent-4-yne

Arrange the following carbanions in order of their decreasing stability:

A. \(\mathrm{H}_3 \mathrm{C}-\mathrm{C} \equiv \mathrm{C}^{-}\)
B. \(\mathrm{H}-\mathrm{C} \equiv \mathrm{C}^{-}\)
C. \(\mathrm{H}_3 \mathrm{C}-\mathrm{\bar{C}H_2}\)

1. A>B>C

2. B>A>C

3. C>B>A

4. C>A>B

The correct order of decreasing reactivity of the following compounds:

Chlorobenzene, 2,4-Dinitrochlorobenzene, and p-Nitrochlorobenzene

with an electrophile (E⁺)  is :

$\mathrm{Ethyne} \stackrel{?}{\to }$ $\mathrm{Benzene}$ 

The reagent used in the above conversion is:

1. Cr₂O₃

2. Alc. KOH

3. Red hot Fe

4. NaNH₂/liq.NH₃

Decreasing order of acidic behavior of benzene, n-hexane, and ethyne is -

1. Hexane > Ethyne > Benzene

2. Benzene > Hexane > Ethyne

3. Ethyne > Benzene > Hexane

4. Benzene > Ethyne > Hexene

The products formed after ozonolysis of Pent-2-ene are:

1. Ethanal and Methanal

2. Ethanal and Propanal

3. Ethanal and Butanal

4. Ethanal and  Ethanal

$\mathrm{Benzene}+{\mathrm{CH}}_3\mathrm{Cl}\stackrel{{\mathrm{AlCl}}_3}{\to } {\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_3$

The mechanism & intermediate involved in the above reaction are:

1. Aromatic electrophilic substitution & carbocation

2. Aromatic Nucleophilic substitution & carbanion

3. Aromatic free radical substitution & Free radical

4. Carbene based substitution reaction & Carbene

The product(s) obtained via oxymercuration (HgSO₄ + H₂SO₄ ) of but-1-yne is -

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{CH}}_3$

2. CH₃CH₂ CH₂-CHO

3. CH₃CH₂CHO + HCHO

4. CH₃ CH₂COOH + HCOOH

Which of the following Hydrocarbon has the highest octane number?

1. Methane

2. Ethane

3. Iso-octane

4. Triptane