Competitive Thinking

Which of the following alkyl halide is used as a methylating agent?

$50\%$ of the reagent is used for dehydrohalogenation of $6.45 \mathrm{g} {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}$. What will be the weight of the main product obtained?
[Atomic mass of $\mathrm{H}, \mathrm{C}$ and $\mathrm{Cl}$ are $1, 12$ and $35.5 \mathrm{g}/\mathrm{mole}$, respectively].

Assertion: Reaction of but-$1$-ene with $\mathrm{HBr}$ gives $1$-bromobutane as major product.

Reason: Addition of hydrogen halides to alkenes proceeds according to Markovnikov’s rule.

The CORRECT answer is

$12.3 \mathrm{g}$ $\text{1-bromopropane}$ is treated with alcoholic $\text{KOH}$. What mass of propene is obtained if yield is $50\%$? 

(Atomic Mass of $\mathrm{C}=12\mathrm{g}, \mathrm{H}=1\mathrm{g}, \mathrm{Br}=79\mathrm{g}$).

$3-\text{Methylpent}-2-\text{ene}$ on reaction with $\mathrm{HBr}$ in the presence of peroxide forms an addition product. The number of possible stereo isomers for the product is ____.

An example of a sigma bonded organometallic compound is ____.

Which of the following reaction/s can be used for the preparation of alkyl halides?
$\left(\mathrm{I}\right)$ ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{OH + HCl }\stackrel{{\text{anhydrous ZnCl}}_{\text{2}}}{\to }$

$\left(\mathrm{II}\right)$ ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{OH + HCl }\stackrel{}{\to }$

$\left(\mathrm{III}\right)$ ${\text{(CH}}_{\text{3}}{\text{)}}_{\text{3}}\text{COH+ HCl }\stackrel{}{\to }$

$\left(\mathrm{IV}\right)$ ${\text{(CH}}_{\text{3}}{\text{)}}_{\text{2}}\text{CHOH+ HCl }\stackrel{{\text{anhydrous ZnCl}}_{\text{2}}}{\to }$

For the following reactions:

$\left(\mathrm{a}\right)$ ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}\text{Br + KOH }\stackrel{}{\to }{\text{ CH}}_{\text{3}}{\text{CH = CH}}_{\text{2}}{\text{ + KBr + H}}_{\text{2}}\text{O}$

$\left(\mathrm{b}\right)$ 

$\left(\mathrm{c}\right)$ 

Which of the following statements is/are CORRECT?