The one that will show optical activity is: (en = ethane –

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 Multiple Choice QuestionsMultiple Choice Questions

171.

Increasing order of reactivity of the following compounds for SN1 substitution is:

  • (B) < (C) < (D) < (A)

  • (A) < (B) < (D) < (C)

  • (B) < (C) < (A) < (D)

  • (B) < (A) < (D) < (C)


172.

Which of the following potential energy (PE) diagrams represents the SN1 reaction?


173.

The major product of the following reaction is

CH3C≡CH (ii0 Dl(i)DCl (equilaterent.)

  • CH3C (I) Cl CHD2

  • CH3CD (Cl) CHD (I)

  • CH3CD2CH(Cl) (I)

  • CH3CD(I)CHD (Cl)


174.

The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is

  • D < A < C < B

  • B < C < A < D

  • D < B < A< C

  • A < B < C < D


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175.

The one that will show optical activity is: (en = ethane – 1,2, -diamine)


D.

Among the given options, option d shows optical activity.


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176.

Increasing rate of SN1 reaction in the following compounds is :

  • (B)<(A)<(C)<(D)

  • (A)<(B)<(D)<(C)

  • (B)<(A)<(D)<(C)

  • (A)<(B)<(C)<(D)


177.

The major product of the following reaction is :


178.

Freon used as refrigerant is

  • CF2=CF2

  • CH2F2

  • CCl2F2

  • CF4


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179.

2-Phenylethylbromide when heated with NaOEt, elimination takes place. No deuterium exchange takes place when the reaction is carried out in C2H5OD solvent. The mechanism will be

  • E1 elimination

  • E2 elimination

  • E1 cB elimination

  • E2 or E1cB


180.

For the following reactions,

i) CH3 CH2 CH2Br + KOH --> CH3CH=CH2 +KBr +H2O

ii)  


iii) 

  • (i) is elimination reaction, (ii) is substitution reaction, and (iii) is addition reaction.

  • (i) is elimination reaction, (ii) is addition reaction, (iii) is substitution reactions.

  • (i) is substitution, (ii) addition reaction (iii) is addition reactions

  • (i) is substitution, (ii) addition reaction (iii) is addition reactions

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