Identify the suitable reagent for the reaction given below.
$CH_3-CO-CH_3 \xrightarrow[(ii) H_3O^+]{(i) ?} (CH_3)_3C-OH$

The compound $(x)$ in the above reaction is:

Assertion $(A)$: Aldehydes are more reactive than ketones towards nucleophilic addition reactions.
Reason $(R)$: In aldehydes,carbonyl carbon is less electrophilic compared to ketones.
The correct answer is

Which of the following compounds gives the iodoform test?

Which is the major product of the following reaction?

Given below are two statements:
Statement $I$: Cross aldol condensation between two different aldehydes will always produce four different products.
Statement $II$: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH,it forms a condensation product with acetophenone only.
In the light of the above statements,choose the correct answer from the options given below: