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Engineering
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The IUPAC name of the compound shown below is

  • Option 1)

    2-bromo-­6-chlorocyclohex­-1-­ene

  • Option 2)

    6-­bromo­-2-­chlorocyclohexene

  • Option 3)

    3­-bromo­-1-­chlorocyclohexene

  • Option 4)

    1-­bromo­-3-chlorocyclohexene.

 

As we learnt in

Nomenclature of organic compound -

1)    Some of locant value or position no. of substituent should be minimum.

 

2)    Senior functional group written in the form of suffix.

 

3)    Junior  functional group written in the form of prefix.

- wherein

1)

2)Butan-2-ol

3)3 -Hydroxy Hexanal

Image result for 3 hydroxy hexanal

 

 The IUPAC name of is  

3­-bromo­-1-­chlorocyclohexene


Option 1)

2-bromo-­6-chlorocyclohex­-1-­ene

This option is incorrect

Option 2)

6-­bromo­-2-­chlorocyclohexene

This option is incorrect

Option 3)

3­-bromo­-1-­chlorocyclohexene

This option is correct

Option 4)

1-­bromo­-3-chlorocyclohexene.

This option is incorrect

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Engineering
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The increasing order of stability of the following free radicals is

  • Option 1)

    (CH_{3})_{2}\dot{C}H< (CH_{3})_{3}\dot{C}< (C_{6}H_{5})_{2}\dot{C}H< (C_{6}H_{5})_{3}\dot{C}

  • Option 2)

    (C_{6}H_5)_3\dot{C}< (C_{6}H_5)_2\dot{C}H< (CH_3)_3\dot{C}< (CH_3)_2\dot{C}H

  • Option 3)

    (C_{6}H_5)_2\dot{C}H< (C_{6}H_5)_3\dot{C}< (CH_3)_3\dot{C}< (CH_3)_2\dot{C}H

  • Option 4)

    (CH_{3})_{2}\dot{C}H< (CH_{3})_{3}\dot{C}< (C_{6}H_{5})_{3}\dot{C}< (C_{6}H_{5})_{2}\dot{C}H

 

As we learnt in

Stability of alkyl free radical -

Electron donating group stabilises alkyl free radicals and withdrawing group destabilises alkyl free radicals.

- wherein

 

 

Stability of alkyl free radical due to resonance -

More the no of resonating structure more is the stability.

- wherein

 

 Free radical is stabilised due to resonance, hyperconjugation and inductive effect. In given problem the order of stability of free radical is 

(CH_{3})_{2}\dot{C}H< (CH_{3})_{3}\dot{C}< (C_{6}H_{5})_{2}\dot{C}H< (C_{6}H_{5})_{3}\dot{C}


Option 1)

(CH_{3})_{2}\dot{C}H< (CH_{3})_{3}\dot{C}< (C_{6}H_{5})_{2}\dot{C}H< (C_{6}H_{5})_{3}\dot{C}

This option is correct

Option 2)

(C_{6}H_5)_3\dot{C}< (C_{6}H_5)_2\dot{C}H< (CH_3)_3\dot{C}< (CH_3)_2\dot{C}H

This option is incorrect

Option 3)

(C_{6}H_5)_2\dot{C}H< (C_{6}H_5)_3\dot{C}< (CH_3)_3\dot{C}< (CH_3)_2\dot{C}H

This option is incorrect

Option 4)

(CH_{3})_{2}\dot{C}H< (CH_{3})_{3}\dot{C}< (C_{6}H_{5})_{3}\dot{C}< (C_{6}H_{5})_{2}\dot{C}H

This option is incorrect

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