giúp em một số pt này ạ

Đáp án:

(1) $HCOOH+CH_3OH\buildrel{{H_2SO_4 đ, t^o}}\over\rightleftharpoons HCOOCH_3+H_2O$ 

(2) $HOCH_2CH_2OH+CH_3COOH \buildrel{{H_2SO_4 đ, t^o}}\over\rightleftharpoons HOCH_2CH_2OOCH_3+H_2O$

(3) $(COOH)_2+CH_3OH \buildrel{{H_2SO_4 đ, t^o}}\over\rightleftharpoons HOOC-COOCH_3+H_2O$ 

(4) $HOCH_2CH_2OH+2HCOOH \buildrel{{H_2SO_4 đ, t^o}}\over\rightleftharpoons HCOOCH_2-CH_2OOCH+2H_2O$ 

(5) $HOCH_2COOH+HCOOH \buildrel{{H_2SO_4 đ, t^o}}\over\rightleftharpoons HCOOCH_2COOH + H_2O$ 

(6) $HOCH_2COOH+C_2H_5OH \buildrel{{H_2SO_4 đ, t^o}}\over\rightleftharpoons HOCH_2COOC_2H_5+H_2O$ 

(7) $CH_2=CHCOOH+CH_2=CHCH_2OH \buildrel{{H_2SO_4 đ, t^o}}\over\rightleftharpoons CH_2=CHCOOCH_2-CH=CH_2+H_2O$