In an SN1 reaction on chiral centres there is
1. 100% racemisation
2. inversion more than retention leading to partial racemisation
3. 100% retention
4. 100% inversion
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyKI in acetone, undergoes SN2 reaction with each of P,Q,R ans S, the rates of the reaction vary as:
(1) P>Q>R>S
(2) S>P>R>Q
(3) P>R>Q>S
(4) R>P>S>Q
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyConsider the following bromides:
the correct order of SN1 reactivity is:
1. A>B>C
2. B>C>A
3. B>A>C
4. C>B>A
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe electrophile. E attacks the benzene ring to generate the intermediate - complex. Of the following which - complex is of lowest energy?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf X is halogen the correct order for SN2 reactivity is-
1. R2CHX > R3CX > RCH2X
2. RCH2X > R3CX > R2CHX
3. RCH2X > R2CHX > R3X
4. R3CX > R2CHX > RCH2X
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe compound which reacts with HBr obeying Markownikoff's rule is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe formation of cyanohydrin from a ketone is an example of:
(1) electrophilic addition
(2) nucleophilic addition
(3) nucleophilic substitution
(4) electrophilic substitution
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is an example of the elimination reaction?
(1) Chlorination of methane
(2) dehydration of ethanol
(3) nitration of benzene
(4) hydroxylation of ethylene
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe SN2 mechanism for R-X + KOH (aq) R-OH + KX follows with:
(1) 100% inversion
(2) 50% inversion
(3) 40% inversion
(4) 30% inversion
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich one is the elimination reaction?
1. CH3CH3+Cl2CH3CH2Cl+ HCl
2. CH3Cl+ KOH(aq.) CH3OH +KCl
3. CH2=CH2 +Br2 CH2BrCH2Br
4. C2H5Br+ KOH(alc.) C2H4 + KBr+H2O
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology