Dehydrogenation of ethanol to give ethanal is:
Ease of abstraction of hydrogen is greater when attached to:
(1) 1 carbon
(2) 2 carbon
(3) 3carbon
(4) neo carbon
Which step is the chain termination step in the following mechanism?
1. (i)
2. (ii)
3. (iii)
4. (iv)
Which step is chain propagation step in the following mechanism?
1. (i)
2. (ii)
3. (iii)
4. (iv)
Carbanion can undergo:
1. rearrangement
2. combination with cation
3. addition to a carbonyl group
4. all of the above are correct
The SN1 mechanism for substitution reaction by nucleophile is favored by:
1. Low concentration of nucleophile
2. Weak nature of the nucleophile
3. Polar solvent
4. All of the above
SN1 mechanism for the reaction,
R-X+KOHROH+KX follow:
(1) carbocation mechanism
(2) carbanion mechanism
(3) free radical mechanism
(4) either of these
The elimination reaction among the following is:
1. CH3CH3+Cl2CH3CH2Cl+ HCl
2. CH3Cl+ KOH(aq.) CH3OH +KCl
3. CH2=CH2 +Br2 CH2BrCH2Br
4. C2H5Br+ KOH(alc.) C2H4 + KBr+H2O
The SN2 mechanism for R-X + KOH (aq) R-OH + KX follows with:
(1) 100% inversion
(2) 50% inversion
(3) 40% inversion
(4) 30% inversion
Which 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