Appropriate reducing agent for the following conversion is:
$CH_2=CH-CH_2-CHO \to CH_3-CH_2-CH_2-CH_2OH$

$Br-CH_2-CH=CH-CH_2-Br \xrightarrow{Zn (dust)} (A)$
Above reaction is an example of $1,4$-elimination. Predict the product.

Write the main product of the given reactions:
$(1)$ $CH_3CH = CHCH_3 + HBr \to$
$(2)$ $CH_3-C(CH_3)=CH_2 + HBr \to$

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Cis form of alkene is found to be more polar than the trans form.
Reason $(R)$: Dipole moment of trans isomer of $2$-butene is zero.
In the light of the above statements,choose the correct answer from the options given below:

The reaction of bromine with an alkene is an example of which of the following?

Electrolysis of cold concentrated aqueous solution of potassium succinate yields: