The molecule among the following having the highest reactivity toward the SN¹ reaction is:

1. C₆H₅CH(C₆H₅)Br

2. C₆H₅CH(CH₃)Br

3. C₆H₅C(CH₃)(C₆H₅)Br

4. C₆H₅CH₂Br

A: Inductive effect is a permanent effect.

R: $-{\mathrm{CH}}_3$ group shows +l effect.

1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion

3. Assertion is a true statement but Reason is false.

4. Both Assertion and Reason are false statements.

A: Resonating structures should have the same number of unpaired electrons.

R: The energy content of all resonating structures is the same.

1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but Reason is false.

4. Both Assertion and Reason are false statements.

A: Cyclopentadienyl anion is much more stable than allyl anion.

R: Cyclopentadienyl anion is aromatic while allyl anion is only resonance stabilized.

1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but Reason is false.

4. Both Assertion and Reason are false statements.

A: Benzene and naphthalene are aromatic hydrocarbons.

R: Benzene and naphthalene contain the same number of delocalized $\mathrm{\pi }$ electrons.

1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but Reason is false.

4. Both Assertion and Reason are false statements, then mark (4).

A: Alkyl groups show +l effect.

R: Halogens are -l and +R groups.

1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but Reason is false.

4. Both Assertion and Reason are false statements.

A:  is the most stable alkene due to 12-$\alpha$ hydrogen atoms

R: 'H' is more electronegative than carbon.

1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion

3. Assertion is a true statement but Reason is false.

4. Both Assertion and Reason are false statements. 

A: A compound having a non-superimposable mirror image is optically active.

R: Optically active compound must contain chiral carbon.

1. Both Assertion & Reason are true and the reason is the correct explanation of the assertion.

2. Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but Reason is false

4. Both Assertion and Reason are false statements.

Which of the following compounds is isomeric with methyl vinyl ether?

1. Propanal

2. 1-propanol

3. Ethyl methyl ether

4. Dimethylether

The number of chiral centers present in 3,4-dibromo-2-pentanol is/are :

1. 1

2. 2

3. 3

4. 4