Methods of Preparation of Alkenes

Which of the following compound is formed on acid dehydration of ethanol?

2-hexyne gives trans-2-hexene on treatment with –

Hydrogenation of the adjoining compound in the presence of poisoned palladium catalyst gives –

The reagent(s) for the following conversion,

is/are

Cyclohexene is best prepared from cyclohexanol by which of the following?

Among the following compounds which can be dehydrated very easily is

Identify the set of reagents/ reaction conditions ('X' and 'Y') in the following set of transformations.

A solution of $20.2 g$ of $1,2$ -dibromopropane in $MeOH$ upon heating with excess $Zn$ produces $3.58 g$ of an unsaturated compound $X .$ The yield ($\%$) of $X$ is closest to [Atomic weight of Br is $80$]

The compound that undergoes dehydration most readily is

From which one of the following both ethylene and acetylene could be prepared in a single step reaction?

Which of the following methods cannot be considered suitable for preparing ether?

Which of the following reagents is used in converting in trans-form GI
   
 

$0.396 gm$ of a bromoderivative of a hydrocarbon $\left(A\right)$ when vapourised occupied $67.2 ml$ at $NTP$. On reaction with aqueous $NaOH \left(A\right)$ gives $\left(B\right). \left(B\right)$ when passed over alumina at ${250}^{o}C$ gives a neutral compound $\left(C\right)$, while at ${350}^{o}C$ it gives a hydrocarbon $\left(D\right), \left(D\right)$ when heated with $HBr$ gives an isomer of $\left(A\right)$. When $\left(D\right)$ is treated with conc. $H_{2}S{O}_4$ and the product is diluted with water and distilled, $\left(E\right)$ is obtained. Identify $\left(A\right)$ to $\left(E\right)$ and explain the reactions involved.

Dehydration of alcohols by concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ takes place according to the following steps:

 The slowest and fastest steps in the above reaction are:

Which of the following compounds gives the most stable carbonium ion on dehydration?

n–butane on monobromination gives three isomers. The number of product(s) obtained when the major product is heated with KOH in CH₃CH₂OH is/are …..

Optically active was found to have lost its optical activity after standing in water containing a few drops of acids, mainly due to the formation of

The product that should be formed in the reaction is:

${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3\genfrac{}{}{0pt}{}{\stackrel{\left(\mathrm{i}\right)\mathrm{ }{\mathrm{H}}_2, {\mathrm{lindlar}}^{\mathrm{\prime }}\mathrm{s}\mathrm{ }\mathrm{catalyst}}{\to }}{\left(\mathrm{ii}\right) {\mathrm{Br}}_2/{\mathrm{CCl}}_4}\mathrm{Product}$

How many structures of $X$ is possible?

Identify X and Y in the following reaction sequence