Dehydrogenation of ethanol to give ethanal is:$\left(1\right) \mathrm{additional} \mathrm{reaction}$
$\left(2\right) \mathrm{\alpha }-\mathrm{\alpha } \mathrm{elimination} \mathrm{reaction}$
$\left(3\right) \mathrm{\alpha }-\mathrm{\beta } \mathrm{elimination} \mathrm{reaction}$
$\left(4\right) \mathrm{\alpha }-\mathrm{\gamma } \mathrm{elimination} \mathrm{reaction}$

Ease of abstraction of hydrogen is greater when attached to:

(1) 1$°$ carbon

(2) 2$°$ carbon

(3) 3$°$carbon

(4) neo carbon

Which step is the chain termination step in the following mechanism?

$\left(\mathrm{i}\right) {\mathrm{Cl}}_2\stackrel{h\nu }{\to }{\mathrm{Cl}}^{\bullet }+{\mathrm{Cl}}^{\bullet }$
$\left(\mathrm{ii}\right) {\mathrm{Cl}}^{\bullet }+ {\mathrm{CH}}_4\to \stackrel{\bullet }{{\mathrm{CH}}_3}+ \mathrm{HCl}$
$\left(\mathrm{iii}\right)\stackrel{\bullet }{\mathrm{C}}{\mathrm{H}}_3+{\mathrm{Cl}}_2\to {\mathrm{CH}}_3\mathrm{Cl}+{\mathrm{Cl}}^{\bullet }$
$\left(\mathrm{iv}\right){\mathrm{Cl}}^{\bullet }+\stackrel{\bullet }{\mathrm{C}}{\mathrm{H}}_3\to {\mathrm{CH}}_3\mathrm{Cl}$

1. (i)

2. (ii)

3. (iii)

4. (iv)

Which step is chain propagation step in the following mechanism?

$\left(\mathrm{i}\right) {\mathrm{Cl}}_2\stackrel{h\nu }{\to }{\mathrm{Cl}}^{\bullet }+{\mathrm{Cl}}^{\bullet }$
$\left(\mathrm{ii}\right) {\mathrm{Cl}}^{\bullet }+ {\mathrm{CH}}_4\to \stackrel{\bullet }{{\mathrm{CH}}_3}+ \mathrm{HCl}$
$\left(\mathrm{iii}\right){\mathrm{Cl}}^{\bullet }+{\mathrm{Cl}}^{\bullet }\stackrel{}{\to }{\mathrm{Cl}}_2$
$\left(\mathrm{iv}\right)\stackrel{\bullet }{{\mathrm{CH}}_3}+ \mathrm{HCl}\to {\mathrm{CH}}_3\mathrm{Cl}$

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 S_N1 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

S_N1 mechanism for the reaction,

R-X+KOH$\to$ROH+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+Cl₂$\to$CH₃CH₂Cl+ HCl

2. CH₃Cl+ KOH(aq.) $\to$CH₃OH +KCl

3. CH₂=CH₂ +Br₂ $\to$CH₂BrCH₂Br

4. C₂H₅Br+ KOH(alc.) $\to$C₂H₄ + KBr+H₂O

The S_N2 mechanism for R-X + KOH (aq) $\to$ 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