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

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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).


A.

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

In cycloalkane the heat of combustion of cyclohexane (657.9 kJ mol-1) is the lowest, hence, it is the most stable cycloalkane. Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain, therefore cyclopropane and cyclobutane are reactive cycloalkane.


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112.

Identify X and Y in the following reactions-


113.

This reaction is known as

  • Wurtz-Fittig reaction

  • Wurtz reaction

  • Fittig reaction

  • Friedel-Crafts reaction


114.

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

  • (CH3)3CX

  • (CH3)2CHX

  • CH3CH2X

  • CH3X


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115.

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


116.

DDT is related to

  • insecticide

  • fungicide

  • chlorination

  • florination


117.

Which one of the following notations shows product incorrectly?

  • Cm96242 (α, 2n) Bk97243

  • B510 (α, n) N713

  • N714 (n, p) C614

  • Si1428 (d, n) P1529


118.

Carbon-halogen bond is strongest among the following

  • CH3Cl

  • CH3Br

  • CH3F

  • CH3I


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119.

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

  • Chlorobenzene 

  • Vinyl chloride

  • Allyl chloride

  • p-chlorotoluene


120.

Most stable ion is

  • C6H5CH2+

  • (CH3)3-C+

  • (CH3)2CH+

  • CH3CH2+


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