Identify A and B in the following reaction, ${\mathrm{CH}}_3{\mathrm{CH}}_3\stackrel{\mathrm{B}}{\leftarrow }{\mathrm{CH}}_3\mathrm{COOH}\stackrel{\mathrm{A}}{\to }{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$
 

	A	B
1	HI + Red P	LiAlH4
2	Ni/$△$	LiAlH4
3	LiA/H4	HI + Red P
4	Pd-BaSO4	Zn + HCl

CH₃CH₃ ← B CH₃COOH → A CH₃CH₂OH

Options

Answer

Option (3)

A = LiAlH₄, B = HI + red P

LiAlH₄ reduces carboxylic acids to primary alcohols:
CH₃COOH → CH₃CH₂OH

HI (with red P, heated) reduces the –COOH group to the corresponding alkane (loss of the carboxyl carbon):
CH₃COOH → CH₃CH₃