111.

Assertion (A) : Cyclohexane is the most stable cycloalkane.

Reason (R) : Cyclopropane and cyclobutane are less stable due to angle starin and torsional strain.

The correct answer is-

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true but (R) is not true.

• (A) is not true but (R) is true.

• Both (A) and (R) are true and (R) is the correct explanation of (A).

Identify X and Y in the following reactions-

This reaction is known as

• Wurtz-Fittig reaction

• Wurtz reaction

• Fittig reaction

• Friedel-Crafts reaction

Which one of the following is more reactive towards SN₂ reaction ?

• (CH₃)₃CX

• (CH₃)₂CHX

• CH₃CH₂X

• CH₃X

The reaction between an alkyl halide and sodium metal in dry ether is called

• Clemmensen reduction

• Kolbe's reaction

• Wurtz 's reaction

• Cannizaro's reaction

DDT is related to

• insecticide

• fungicide

• chlorination

• florination

Which one of the following notations shows product incorrectly?

• ${}_{96}{}^{242}\mathrm{Cm} (\mathrm{\alpha }, 2\mathrm{n}) {}_{97}{}^{243}\mathrm{Bk}$

• ${}_5{}^{10}\mathrm{B} (\mathrm{\alpha }, \mathrm{n}) {}_7{}^{13}\mathrm{N}$

• ${}_7{}^{14}\mathrm{N} (\mathrm{n}, \mathrm{p}) {}_6{}^{14}\mathrm{C}$

• ${}_{14}{}^{28}\mathrm{Si} (\mathrm{d}, \mathrm{n}) {}_{15}{}^{29}\mathrm{P}$

Carbon-halogen bond is strongest among the following

• CH₃Cl

• CH₃Br

• CH₃F

• CH₃I

In which of the following compounds, the chlorine atom is most easily substituted?

• Chlorobenzene 

• Vinyl chloride

• Allyl chloride

• p-chlorotoluene

Most stable ion is

• C₆H₅CH₂⁺

• (CH₃)₃-C⁺

• (CH₃)₂CH⁺

• CH₃CH₂⁺