JEE Main 2021 · 24 Feb · Shift 1 · Chemistry Q42

← JEE Main 2021 · 24 Feb · Shift 1

ChemistrySingle correct+4 / -1Question 42 of 90

Which of the following reagent is used for the following reaction ?

$\mathrm{CH_3CH_2CH_3\xrightarrow{?}CH_3CH_2CHO}$

Copper at high temperature and pressure

Molybdenum oxide

Manganese acetate

Potassium permanganate

Answer and worked solution

Official answer: B

Controlled oxidation. Heating an alkane with oxygen over molybdenum oxide stops at the aldehyde (NCERT's example is methane to methanal with Mo₂O₃), so propane gives propanal. Manganese acetate takes alkanes on to carboxylic acids, and KMnO₄ does not stop at the aldehyde.

(B)

Topics:Alkanes

← Previous question Next question →

JEE Main 2021 · 24 Feb · Shift 1, Chemistry question 42